1998 Isuzu Rodeo Engine Diagram

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Specifications Electronic Brake Control Module: Specifications EBCM Fixing Nut.................................................................................................................................. ................................................... 6.9 Nm (60 lb. in.) Engine Controls - ECM Reprogramming Recommendations Engine Control Module: Technical Service Bulletins Engine Controls - ECM Reprogramming Recommendations Information IB03-14-S002 Reprogramming of Powertrain Control Modules (PCM) ISSUE DATE: FEBRUARY 2003 Affected Vehicles All Isuzu Vehicles. Service Information American Isuzu Motors Inc. continually strives to provide the most technically advanced vehicles possible to meet the ever-increasing demands of the SUV market place. One such area of constant change is the calibrations used within the vehicles Powertrain Control Module (PCM). These changes are made as a part of on going product improvements and may take place at anytime including during mid-year production. WHEN SHOULD A PCM CALIBRATION BE UPDATED? Emission Related - Anytime Isuzu determines that a vehicle's calibration may cause emissions non-conformity, Isuzu will release a campaign bulletin. Vehicle owners and dealership personnel will be notified of the campaign. If re-programming is required, all vehicles listed as affected in the campaign bulletin should have the PCM programmed with the updated calibration. Symptom Related - Some vehicles operated under certain conditions may exhibit symptoms that lead to a customer concern. Information relating to symptoms that may be affected by an updated calibration can be found in the comment section of the calibration selection tables. Vehicles should be diagnosed using the symptom description diagnostic tables first, repaired and verified. If (after repairs are completed and verified) the customer's symptom closely match a symptom listed in the comment section of a calibration table for the vehicle, the PCM should be programmed with the updated calibration. All diagnostics, symptoms, Diagnostic Trouble Codes, and broadcast codes must be documented on the dealership repair order. (Reference Section 14 Service Policy and Procedure manual) Diagnostic Trouble Code (DTC) Related - Some vehicles operated under certain conditions may illuminate the Malfunction Indicator Light (MIL). Information relating to DTC's that may be affected by an updated calibration can be found in the comment section of the calibration selection tables. Vehicles should be diagnosed using the DTC diagnostic tables first, repaired and verified. If (after repairs are completed and verified) the customers DTC match a DTC listed in the comment section of a calibration table for the vehicle, the PCM should be programmed with the updated calibration. All diagnostics, symptoms, Diagnostic Trouble Codes and broadcast codes must be documented on the dealership repair order. (Reference Section 14 Service Policy and Procedure manual) Technical Service Bulletin (TSB) - Anytime when performing the operations listed in a TSB and you are directed to program with an updated calibration. WHEN SHOULD A PCM CALIBRATION NOT BE UPDATED? No Problem Found (NPF) - Unless specifically directed by an Isuzu Service Bulletin, a PCM should not be programmed with an updated calibration before repairs have been diagnosed, repaired and verified. Vehicle is found not to have the latest calibration available - Do not reprogram a PCM with an updated calibration under warranty solely because a later version is available. Do not assume all vehicle operators will benefit from changes made in later calibration releases. Beginning with the 2000 model year lsuzu PCM's have an adaptive learning function. During the "learning" cycle, engine performance and transmission shift characteristics will be altered that could lead to customer complaints. Programming a PCM with an updated calibration is warrantable only as a result of a failure as listed above. Isuzu does not warrant that vehicles will be provided product improvements made after manufacture. Disclaimer Testing and Inspection System Relay: Testing and Inspection 1. Disconnect heater relay (X-6). 2. Check for continuity between the terminals of heater relay. Page 21 Electronic Brake Control Module: Electrical Diagrams Brake Pedal Switch Schematic Rear Wheel Antilock Brakes Electronic Brake Control Module: Description and Operation Rear Wheel Antilock Brakes RWAL EBCM Inputs And Outputs CODE STORAGE EBCMs can store one diagnostic trouble code only while the ignition key is in the ON or ACC position. When the ignition key is turned to the OFF position, or the vehicle is restarted, any diagnostic trouble code in the memory will be erased. Clear Memory - to make sure all codes are clear. The EBCM can only store one diagnostic trouble code in its memory. If more than one fault occurs, only the first fault will be stored. It is very important to clear the EBCM memory and test drive a vehicle after RWAL repairs, to make sure that other system faults do not exist. EBCM FUNCTIONS The EBCM is a microprocessor which performs the following. Receives information from several switches and the speed sensor. - Compares this information to preprogrammed values. - Sends output as necessary to the anti-lock hydraulic valve assembly and indicator lamps. SELF CHECKS Each time the ignition switch is turned from OFF to ON, the EBCM does a self-check of its internal circuits and of the RWAL system circuitry. During normal driving and braking, the EBCM continues to check wiring condition, anti-lock hydraulic valve assembly function, and other possible fault areas. If a fault is noted at any time, the EBCM will: Immediately shut down the RWAL system (returning the vehicle to normal, non-RWAL braking capability) - Light the "Rr ABS" and "BRAKE" indicator lamps - Store a trouble code in its memory to aid in diagnosis. FAIL-SAFE In the rare event that the anti-lock hydraulic valve assembly does not respond to RWAL system shutdown, the EBCM will blow an internal fuse pellet to physically open the electrical circuit to the valve assembly and prevent the valve from having any effect on brake hydraulic pressure. Page 22 Electronic Brake Control Module: Service Precautions CAUTION: - Do not remove or apply power to the EBCM with the battery cables connected. - There are no replaceable parts inside the EBCM; it can only be replaced as an assembly. Do not replace the EBCM unless so instructed in the diagnosis chart. NOTE: - Always turn the ignition OFF before removing or connecting battery cables, fuses or connectors. - The EBCM requires its own clean, dedicated ground. If other accessories are connected to this ground, the EBCM may be damaged. - Aftermarket accessory wiring must not be routed over or next to the EBCM. Electrical interference from cellular phones, stereo amplifiers, etc., can affect the EBCM operation. - Some test procedures require you to leave the ignition switch ON while test procedures are performed. If this drains the battery, you may get false readings. If vehicle system voltage gets low, connect a battery charger and apply a slow charge while testing. Page 59 PCM Pinouts - Row B Page 28 Electronic Brake Control Module: Service and Repair 4 Wheel Antilock Brakes Electronic Brake Control Module (EBCM) REMOVAL CAUTION: As EBCM consists of precision parts, be careful not to expose it to excessive shock. Preparation - Remove battery ground cable. 1. Nut 2. Harness connector Solenoid Connector ^ Remove harness connector fixing bolt. ^ Remove harness connector. 3. Nut 4. EBCM INSTALLATION 1. EBCM (4) 2. Nut (3) ^ Tighten the EBCM fixing nut to specified torque. Locations Rear Wheel Antilock Brakes Electronic Brake Control Module: Service and Repair Rear Wheel Antilock Brakes RWAL EBCM Replacement CAUTION: There are no replaceable parts inside the EBCM; it can only be replaced as an assembly. Do not replace the EBCM unless so instructed in the diagnosis chart. 1. Remove the passenger seat assembly. 2. With the ignition OFF, unplug the harness connector. 3. Remove the EBCM and bracket assembly. 4. Installation is the reverse of removal. Page 61 PCM Pinouts - Row D Page 55 Engine Control Module: Technical Service Bulletins PCM - Reprogramming BULLETIN NUMBER: IBOO-S002 ISSUE DATE: JANUARY 2000 GROUP: INFORMATION PCM REPROGRAMMING AFFECTED VEHICLES All Isuzu built units with reprogrammable PCM. It is strongly recommended NOT to reinstall the same software or calibration files when reprogramming a Powertrain Control Module. There is no technical reason that the download files inside the PCM would ever become corrupted after the control module had previously been successfully programmed. With the 2.2L and 4.3L Hombre, a P0601 (Control Module Read Only Memory) Diagnostic Trouble Code could set in memory and the MIL could illuminate if the controller memory became corrupted. After a necessary reprogramming, it is feasible that certain learned values such as fuel trim, IAC learned positions, certain OBD II diagnostic thresholds, and automatic transmission shift adapts for the engine or transmission might revert back to their original unlearned starting points. As a result, the engine and transmission may temporarily operate differently until the values are re-learned. Page 64 Engine Control Module: Electrical Diagrams Page 38 ABS Light Relay: Description and Operation Lamp Driver Relay (LDR) The Lamp Driver Relay (LDR) is a "normally closed" relay. The relay receives a signal from the Electronic Brake Control Module (EBCM) to turn off the ("ABS") warning light. Unless the EBCM commands the ("ABS") warning light off, it will remain illuminated. The LDR is mounted on the right inner fender, next to the hydraulic unit. Page 18 Electronic Brake Control Module: Locations 4 Wheel Antilock Brakes System Components The EBCM is mounted to the ABS hydraulic unit bracket in the right rear of the engine compartment. Page 29 Specs: Torque to 6.9 Nm (60 lb.in.) 3. Harness connector (2) 4. Nut (1) ^ Tighten the EBCM fixing nut to specified torque. Specs: Torque to 6.9 Nm (60 lb.in.) Connector Views Engine Control Module: Connector Views PCM Pinouts - Row A Page 54 Included in this Service Bulletin is a Replacement PCM Programming Form. This form begins the replacement PCM programming process. When a customer makes an over-the-counter purchase of a replacement PCM, you must provide that customer a photocopy of this form. The form instructs the customer to fill in specific vehicle information, along with a return address; then, to ship the replacement PCM and completed form, together with a check or money order of $55.00 payable to Par-Tech, Inc., to the Par-Tech address printed on the form. Upon receipt at Par-Tech, the replacement PCM will be calibrated using the most current manufacturer specification, and then priority shipped to the return address entered on the form. Page 62 PCM Pinouts - Row E Locations Lamp Driver Relay (LDR) Page 7 ABS Light Relay: Description and Operation Lamp Driver Relay (LDR) The Lamp Driver Relay (LDR) is a "normally closed" relay. The relay receives a signal from the Electronic Brake Control Module (EBCM) to turn off the ("ABS") warning light. Unless the EBCM commands the ("ABS") warning light off, it will remain illuminated. The LDR is mounted on the right inner fender, next to the hydraulic unit. Page 12 ABS Main Relay: Service and Repair 4 Wheel Antilock Brakes Only ABS Enable Relay Lamp Driver Relay ABS ENABLE RELAY/LAMP DRIVER RELAY Removal Preparation - Remove battery ground cable 1. Relay cover 2. ABS enable relay, lamp driver relay Installation To install follow the removal steps in the reverse order. Locations Lamp Driver Relay (LDR) Locations ABS Enable Relay Lamp Driver Relay Page 56 Page 25 Electronic Brake Control Module: Description and Operation 4 Wheel Antilock Brakes Electronic Brake Control (EBCM) COMPONENTS The controlling element of ABS is a microprocessor based EBCM. Inputs to the system include wheel speed sensors accelerometer, brake switch, ignition switch and unswitched battery voltage. Outputs include three bi-directional motor controls, three solenoid controls and the enable relay. A serial data line is used for service diagnostic tools and assembly plant testing. FUNCTION The EBCM monitors the speed of each wheel. If any wheel begins to approach lockup and the brake switch is closed (brake pedal depressed), the EBCM controls the motors and solenoids to reduce brake pressure to the wheel approaching lockup. Once the wheel regains traction, brake pressure is increased until the wheel again begins to approach lockup. This cycle repeats until either the vehicle comes to a stop, the brake pedal is released or no wheels approach lockup. Additionally, the EBCM monitors itself, each input (except the serial data link) and each output for proper operation. If any system malfunction is detected, the EBCM will store a DTC in nonvolatile memory (DTCs will not disappear if the battery is disconnected). Page 11 ABS Main Relay: Description and Operation ABS Enable Relay The ABS enable relay is a normally-open contact type, and has special contact material to handle the high currents required for ABS operation. The relay allows the battery voltage and current to be supplied to the Electronic Brake Control Module (EBCM), which supplies power to the motors and solenoids. The ABS Enable Relay is mounted on the right inner fender, next to the hydraulic unit. Testing and Inspection Tail Lamp Relay: Testing and Inspection Check continuity between the relay terminals. Connector Views Electronic Brake Control Module: Connector Views EBCM Connector View EBCM Connector Chart With 4 Wheel Antilock Brakes Page 60 PCM Pinouts - Row C Rear Wheel Antilock Brakes Electronic Brake Control Module: Locations Rear Wheel Antilock Brakes RWAL EBCM Replacement The EBCM is inside the passenger compartment, under the front right-hand seat. Page 53 Engine Control Module: Technical Service Bulletins PCM - Available Programming for Aftermarket Purchases BULLETIN NUMBER: SB97-03-L004 ISSUE DATE: DECEMBER 1997 GROUP: EMISSIONS PROGRAMMING OF OVER-THE-COUNTER-PURCHASED REPLACEMENT PCMS AFFECTED VEHICLES The following Isuzu LV models and model years: ^ 1996-98 Trooper (UX) ^ 1998 Rodeo (UE) ^ 1996-97 Rodeo (UC) ^ 1996-98 Hombre (TH) ^ 1998 Amigo (UA) SERVICE INFORMATION On August 1, 1995, the Environmental Protection Agency (EPA) issued a Federal regulation requiring all vehicle manufacturers to make programming of powertrain control modules (PCMs) available to the independent aftermarket at a reasonable cost and in a timely manner. This issuance was in response to concerns from consumers and the after market industry regarding the inability to purchase a programmed new or remanufactured PCM in cases where a non-warranty or physical dunnage repair is involved. Replacement PCMs come from the manufacturer requiring programming. If a replacement PCM is installed in an affected vehicle without first being programmed, the vehicle will not operate or it may fail to comply with Federal and State emissions requirements. According to this Federal regulation, programming of replacement PCMs sold over the counter must be made available to the public by no later than December 1, 1997. Isuzu dealers are therefore now responsible for providing customers who purchase a replacement PCM over the counter with the means to have their replacement PCM programmed. All over-the-counter-purchased replacement PCMs will be programmed at the designated programming center - Par-Tech, Inc. Page 63 PCM Pinouts - Row F

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