Engine Control Module (ECM) Diagnostic Trouble Codes (Xc) - 7 of 9: Wiring Volvo V70 II

Checking component and wiring

Check the cable between engine control module (ECM) #B46 and combined instrument panel #4 for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information

1. For connection of engine control module (ECM) breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000) .
2. To connect the combined instrument panel breakout box, see «Connecting the Driver Information Module (DIM) test box»(ref-430932-S26606957942011101900000)
3. To access/replace the combined instrument panel, see «Driver information module (DIM), replacing»(ref-431049-S36933427422011101900000)
4. For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) .
5. For information about the combined instrument panel connector, see «Driver Information Module (DIM) signal description»(ref-430933-S09096821822011101900000) .

Scheme 769

1. Continue Refer to «Verification»(ref-430993-S21273681972011101900000)

Checking components and wiring

The immobilizer function is integrated in the central electronic module (CEM).

The engine control module (ECM) has previously registered a fault in the communication between the immobilizer and the engine control module (ECM), but has detected that this fault is no longer active.

1. Continue Refer to «Information»(ref-430993-S04622875682011101900000)

Checking wiring

Check the cable between system relay terminal 3 and control module terminal A70 (#B10) for an intermittent open-circuit and an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Was a fault detected?

1. YES OKAY: Troubleshooting has been completed.
2. NO FAULT TRACING FAILED: The fault should have been detected and remedied. As this is not the case fault-tracing has failed. Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the wiring

Check the power supply cable between control module terminal #A39 (#A39) and mass air flow (MAF) sensor terminal #4. Check for an intermittent short-circuit to supply voltage.

Check the power supply cable between the control module terminal #A39 (#A39) and boost pressure sensor terminal #1. Check for an intermittent short-circuit to supply voltage.

Check the power supply cable between control module terminal #A39 (#A39) and air conditioning (A/C) pressure sensor terminal #3. Check for an intermittent short-circuit to supply voltage.

Check the power cable between control module terminal #B10 (#B20) and fuel tank pressure sensor connector terminal #3. Check for an intermittent short-circuit to supply voltage.

HINT: Read off the 5-volt power supply by clicking on the VCT2000 symbol.

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000)
2. For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) .
3. To access or replace the mass air flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-430993-S31760131692012011600000)
4. To access or replace the boost pressure sensor: For B5xx4T -2004, see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-430961-S37786365552011101900000) For B5xx4T 2005-, see «Temperature and pressure sensors, replacing»(ref-430961-S28993638692011101900000) .
5. See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) .

Scheme 770

1. Continue Refer to «Information»(ref-430993-S21850080492011101900000)

Scheme 771

Remove the pipe between the air cleaner (ACL) and the turbo / throttle body at the mass air flow (MAF) sensor.

Disconnect the connector from mass air flow (MAF) sensor.

Remove the screws holding the mass air flow (MAF) sensor to the air cleaner (ACL) cover.

Pull and work the mass air flow (MAF) sensor loose from the air cleaner (ACL) cover.

Check the power supply cable between control module terminal #A39 (#A39) and mass air flow (MAF) sensor terminal #4. Check for a short-circuit to supply voltage.

Check the power supply cable between control module terminal #A39 (#A39) and boost pressure sensor terminal #1. Check for a short-circuit to supply voltage.

Check the power supply cable between control module terminal #A39 (#A39) and air conditioning (A/C) pressure sensor terminal #3. Check for a short-circuit to supply voltage.

Check the power cable between control module terminal #B10 (#B20) and fuel tank pressure sensor connector terminal #3. Check for a short-circuit to supply voltage.

HINT: Read off the 5-volt power supply by clicking on the VCT2000 symbol.

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000)
2. For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) .
3. To access or replace the mass air flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-430993-S31760131692012011600000)
4. To access or replace the boost pressure sensor: For B5xx4T -2004, see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-430961-S37786365552011101900000) For B5xx4T 2005-, see «Temperature and pressure sensors, replacing»(ref-430961-S28993638692011101900000) .
5. See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) .

1. Continue Refer to «Verification»(ref-430993-S10026574582011101900000)

Check the power supply cable between control module terminal #A39 (#A39) and mass air flow (MAF) sensor terminal #4. Check for an intermittent short-circuit to ground.

Check the power supply cable between control module terminal #A39 (#A39) and boost pressure sensor terminal #1. Check for an intermittent short-circuit to ground.

Check the power supply cable between control module terminal #A39 (#A39) and air conditioning (A/C) pressure sensor terminal #3. Check for an intermittent short-circuit to ground.

Check the power cable between control module terminal #B10 (#B20) and fuel tank pressure sensor connector terminal #3. Check for an intermittent short-circuit to ground.

HINT: Read off the 5-volt power supply by clicking on the VCT2000 symbol.

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000)
2. For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) .
3. To access or replace the mass air flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-430993-S31760131692012011600000)
4. To access or replace the boost pressure sensor: For B5xx4T -2004, see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-430961-S37786365552011101900000) For B5xx4T 2005-, see «Temperature and pressure sensors, replacing»(ref-430961-S28993638692011101900000) .

1. Continue Refer to «Information»(ref-430993-S21692312892011101900000)

Check the power supply cable between control module terminal #A39 (#A39) and mass air flow (MAF) sensor terminal #4. Check for a short-circuit to ground.

Check the power supply cable between control module terminal #A39 (#A39) and boost pressure sensor terminal #1. Check for a short-circuit to ground.

Check the power supply cable between control module terminal #A39 (#A39) and air conditioning (A/C) pressure sensor terminal #3. Check for a short-circuit to ground.

Check the power cable between control module terminal #B10 (#B20) and fuel tank pressure sensor connector terminal #3. Check for a short-circuit to ground.

HINT: Read off the 5-volt power supply by clicking on the VCT2000 symbol.

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000)
2. For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) .
3. To access or replace the mass air flow (MAF) sensor, see «Mass air flow sensor (MAF), replacing»(ref-430993-S31760131692012011600000)
4. To access or replace the boost pressure sensor: For B5xx4T -2004, see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-430961-S37786365552011101900000) For B5xx4T 2005-, see «Temperature and pressure sensors, replacing»(ref-430961-S28993638692011101900000) .
5. See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) .

1. Continue Refer to «Verification»(ref-430993-S20753778562011101900000)

Check the power supply cable between control module terminal #A39 (#A39) and mass air flow (MAF) sensor terminal #4. Check for a short-circuit to supply voltage.

Check the power supply cable between control module terminal #A39 (#A39) and boost pressure sensor terminal #3. Check for a short-circuit to supply voltage.

Check the power supply cable between control module terminal #A39 (#A39) and air conditioning (A/C) pressure sensor terminal #3. Check for a short-circuit to supply voltage.

HINT: Read off the voltage on the 5 volt power supply by clicking on the VCT2000 symbol.

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000)
2. For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) .
3. For the location of components: For turbocharged engines -2001, see «Location of components»(ref-430982-S15631897472011101900000) For turbocharged engines 2002, see «Location of components, engine compartment»(ref-430982-S26522438492011101900000) For turbocharged engines 2003-, see «Location of components, engine compartment»(ref-430982-S36428841102011101900000) For B5254T4 2004-, see «Location of components, engine compartment»(ref-430982-S37883263132011101900000) .
4. To access or replace the boost pressure sensor: For B5xx4T -2004, see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-430961-S37786365552011101900000) For B5xx4T 2005-, see «Temperature and pressure sensors, replacing»(ref-430961-S28993638692011101900000) .
5. See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) .

1. Continue Refer to «Verification»(ref-430993-S03399827612011101900000)

Check the power supply cable between control module terminal #A39 (#A39) and mass air flow (MAF) sensor terminal #4. Check for a short-circuit to ground.

Check the power supply cable between control module terminal #A39 (#A39) and boost pressure sensor terminal #3. Check for a short-circuit to ground.

Check the power supply cable between control module terminal #A39 (#A39) and air conditioning (A/C) pressure sensor terminal #3. Check for a short-circuit to ground.

HINT: Read off the voltage of the 5-volt power supply by clicking on the VCT2000 symbol.

Remedy as necessary.

Other information

1. To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000)
2. For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) .
3. For the location of components: For turbocharged engines -2001, see «Location of components»(ref-430982-S15631897472011101900000) For turbocharged engines 2002, see «Location of components, engine compartment»(ref-430982-S26522438492011101900000) For turbocharged engines 2003-, see «Location of components, engine compartment»(ref-430982-S36428841102011101900000) For B5254T4 2004-, see «Location of components, engine compartment»(ref-430982-S37883263132011101900000) .
4. To access or replace the boost pressure sensor: For B5xx4T -2004, see «Intake Air Temperature Sensor (IAT Sensor), replacing»(ref-430961-S37786365552011101900000) For B5xx4T 2005-, see «Temperature and pressure sensors, replacing»(ref-430961-S28993638692011101900000) .
5. See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) .

1. Continue Refer to «Verification»(ref-430993-S13915660772011101900000)

1. Ignition off
2. Check that the stop lamp switch is correctly installed. Check the resistance of the stop lamp switch with the switch pressed in and with the switch released. Take readings between terminals #1 and #5 (component side) on the stop lamp switch. HINT: The stop lamp switch must be closed when the brake pedal is depressed. The resistance of the stop lamp switch must be infinite when the brake pedal is unaffected. Check the stop lamp switch and engine control module (ECM) connectors. Check for contact resistance. Check for oxidation. Check the cable between stop lamp switch terminal #5 (cable harness side) and engine control module (ECM) terminal #B26 (#B36). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage. Check central electronic module (CEM) connector B. Check for contact resistance and oxidation. Check the cable between stop lamp switch terminal #5 (cable harness side) and central electronic module (CEM) terminal #4B. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage. Remedy as necessary. Other information: See «Connecting the breakout box»(ref-430911-S30587875092011101900000) For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) . For resistance values: For turbocharged engines 2001, see «Component specifications»(ref-430975-S12681654262011101900000) . For turbocharged engines 2002, see «Component specifications»(ref-430975-S24294221072011101900000) . For turbocharged engines 2003-, see «Component specifications»(ref-430975-S37637200832011101900000) . For B5254T4 2004-, see «Component specifications»(ref-430975-S19541977602011101900000) . For normally aspirated engines 1999-, see «Component specifications»(ref-451848-S36406831262012020900000) . See «Central electronic module (CEM), replacing»(ref-430924-S13972874222011101900000) See «Checking wiring and terminals»(ref-430909-S26456997912011101900000)

1. Continue Refer to «Verification»(ref-430993-S39717163542011101900000)

Checking the wiring and components

Electronic throttle module (ETM) or Engine control module (ECM) does not work especially well together with CAN-high speed net. The two control modules monitor the CAN-high speed net continuously and are very sensitive to interference on the network. The two control modules will generate diagnostic trouble codes very quickly, if they detect problems on the network and will then reconfigure the system so that it is still possible to drive the vehicle, but then with reduced functionality. If Engine control module (ECM) or Electronic throttle module (ETM) detects a problem on the CAN-bus, this does not indicate that they have caused the interference. Most probable is that, since these control modules are the most sensitive on the CAN-high speed net, they will then also be the first that generate diagnostic trouble code when there is interference on the CAN-net.

As the information states, many of the CAN- and throttle module-related diagnostic trouble codes can be generated due to communication in the CAN-network has been interfered with or interrupted for some reason. Thus, the reconfiguration that takes place does not indicate the cause. Therefore, troubleshoot diagnostic trouble codes for the CAN-net first in all control modules, using troubleshooting for these.

(2001-)

HINT: If there are diagnostic trouble codes stored in central electronic module (CEM) that indicate incorrect communication in CAN-high speed net, troubleshoot according to these before the following troubleshooting is performed. If there are stored diagnostic trouble codes, this indicates that the problem has existed for a longer time, more than 5 seconds. However, if no diagnostic trouble codes are stored, then this indicates that the problem is of a brief nature, shorter time than 5 seconds, likely caused by very brief interference, open circuit or short-circuiting in leads or connections.

(-2000)

HINT: If there are diagnostic trouble codes stored in Driver information module (DIM) that indicate incorrect communication in CAN-high speed net, troubleshoot according to these before the following troubleshooting is performed. If there are stored diagnostic trouble codes, this indicates that the problem has existed for a longer time, more than 5 seconds. However, if no diagnostic trouble codes are stored, then this indicates that the problem is of a brief nature, shorter time than 5 seconds, likely caused by very brief interference, open circuit or short-circuiting in leads or connections.

If the VIDA-station with VCT2000 (Volvo Communication Tool 2000) is connected to the vehicle when the battery voltage is low, this may generate diagnostic trouble codes. VCT2000 receives voltage feed from the vehicle, and thus both VCT2000 and control modules can be interfered with and themselves generate interference when their feed voltages are low, (especially when trying to start and the battery is poorly charged). In certain cases, for troubleshooting of a CAN-related diagnostic trouble code, verify using counter and frozen values that the diagnostic trouble code is relevant and not stored during the time in the workshop.

Diagnostic trouble codes generated during troubleshooting can be identified using the frozen values and counters that are stored together with the diagnostic trouble code. Primarily driving distance is to be used to decide if the diagnostic trouble code is generated in the workshop or not. Compare the driving distance in frozen values with the driving distance in driver information module (DIM). If these do not differ too much, it is likely that the diagnostic trouble code was generated during the time that the vehicle was in the workshop. If the driving distance is 0 km/miles, this indicates that the problem has occurred at the control modules' start-up, when a correct driving distance not yet has been received from central electronic module (CEM) or Driver information module (DIM). In these cases, counter 5 can be used to determine when the problem was generated. This prevents fault-tracing an irrelevant code. The risk with too low system voltage in the vehicle can be minimized using a battery charger. In this way voltage is kept stable, if troubleshooting goes on for an extended period of time.

Note. Only use battery chargers that have been approved by Volvo, since too high voltages can cause problems and generate diagnostic trouble codes in the vehicle.

1. Check the connector on the electronic throttle module (ETM). Check for contact resistance and oxidation. In particular, check terminals #3 (CAN H) and #4 (CAN L), #5 (ground) and #6 (voltage).
2. Check the connector on the engine control module (ECM). Check for contact resistance and oxidation. In particular check terminals #A37 (#A37) (CAN H) and #A55 (#A55) (CAN L). In particular, check the wiring, pins and terminals for damage. Check that they are properly inserted into the connector. Check that the cable is properly connected to the pin or terminal.
3. Check the CAN H cable between electronic throttle module (ETM) terminal #3 and engine control module (ECM) #A37 (#A37). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
4. Check the CAN L cable between electronic throttle module (ETM) terminal #4 and engine control module (ECM) #A55 (#A55). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
5. Check the voltage supply cable between electronic throttle module (ETM) terminal #6 and system relay terminal #3 (87). Check for an open-circuit. HINT: With the ignition on, the voltage must be approximately battery voltage between electronic throttle module (ETM) terminal #6 and ground.
6. Check the ground lead between electronic throttle module (ETM) terminal #5 and the car body. Check for an open-circuit. Check for a short-circuit to supply voltage.

If no fault is detected in the above fault-tracing, the fault may be because there was a delay before the system relay switched on. This delay may be due to low battery voltage and/or a mechanical fault in the system relay.

HINT: For markets where upgraded software, released during year 2006 or later, is available, the solution may be to download the upgraded software. In the upgraded software certain adjustments have been made to make it more tolerant against brief CAN-interference. See conditions for respective diagnostic trouble code, for more detailed information about what adjustments have been performed.

Remedy as necessary.

Other information

1. See «Identifying upgraded software ECM/ETM»(ref-430993-S33059322652012011600000)
2. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000)

Choose No to troubleshoot the whole CAN-net.

Note. Then, the information shown to the CAN-high speed net is adapted for 2001-, but also applies in applicable parts for -2000.

Scheme 772

Was a fault detected?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Faulty communication»(ref-430993-S22021919532011101900000)

1. Ignition off. Check the resistance of the clutch pedal sensor between terminals #2 and #4 (component side). Check the clutch pedal and engine control module (ECM) connectors. Check for contact resistance and oxidation. Check the signal cable between engine control module (ECM) terminal #B15 (#B25) and clutch pedal sensor terminal #2 (component side). Check for an open-circuit. Check the signal ground cable between engine control module (ECM) terminal #B4 (#B14) and clutch pedal sensor terminal #4 (cable harness side). Check for an open-circuit. Check the clutch pedal sensor installation. Search for damage and check the connections visually. HINT: With the ignition on, the power supply to the clutch pedal sensor must be approximately 5 V (measured with the clutch pedal sensor disconnected), measured between terminals #2 and #4 (cable harness side). Remedy as necessary. Other information: See «Connecting the breakout box»(ref-430911-S30587875092011101900000) For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) . For resistance values: For turbocharged engines 2001, see «Component specifications»(ref-430975-S12681654262011101900000) . For turbocharged engines 2002, see «Component specifications»(ref-430975-S24294221072011101900000) . For turbocharged engines 2003-, see «Component specifications»(ref-430975-S37637200832011101900000) . For B5254T4 2004-, see «Component specifications»(ref-430975-S19541977602011101900000) . For normally aspirated engines 1999-, see «Component specifications»(ref-451848-S36406831262012020900000) . See «Checking components and wiring»(ref-430993-S12461082402011101900000) See «Checking wiring and terminals»(ref-430909-S26456997912011101900000)

1. Continue Refer to «Verification»(ref-430993-S38374639002011101900000)

1. Ignition off. Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation. Check the resistance values of the potentiometers in the throttle unit. Check that the shutter in the throttle unit is not blocked or sticking. Clean as necessary. Check the function of the integrated return spring in the throttle unit by carefully manually turning the throttle to wide open position and then carefully releasing the throttle. Check that the return spring returns the shutter to its resting position. If the return spring does not return the shutter, the throttle unit is defective. Remedy as necessary. Other information: See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) For resistance values: For turbocharged engines 2001, see «Component specifications»(ref-430975-S12681654262011101900000) . For turbocharged engines 2002, see «Component specifications»(ref-430975-S24294221072011101900000) . For turbocharged engines 2003-, see «Component specifications»(ref-430975-S37637200832011101900000) . For B5254T4 2004-, see «Component specifications»(ref-430975-S19541977602011101900000) . For normally aspirated engines 1999-, see «Component specifications»(ref-451848-S36406831262012020900000) . For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) . To access or replace the throttle unit: For B5xx4T -2001, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S23357003322011101900000) . For B5xx4T 2002-2004, see «Replacing the throttle body (TB)»(ref-430985-S29652099132011101900000) . For B5xx4T 2005-, B5244T5 and B5254T4 do not apply, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S35865188232011101900000) . For B5254T4 and B5244T5 2004-, see «Throttle body (electronic throttle module (ETM)), replacing (B5254T4 and B5244T5 2004-)»(ref-430993-S23494846432012011600000) . To clean the throttle unit: For -2004, see «Throttle body, cleaning»(ref-430964-S10707071812011101900000) For 2005- B5xx4T, does not apply to B5244T5, see «Throttle body (TB), cleaning»(ref-430964-S09703773472011101900000) For 2005- B5244T5, see «Throttle body (TB), cleaning (2005- B5244T5)»(ref-430993-S05048123262012011600000) .

1. Continue Refer to «Adaptation of the throttle unit»(ref-430993-S39346930192011101900000)

1. Ignition off. Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation. Check the resistance values of the potentiometers in the throttle unit. Check the signal cable (potentiometer 1) between engine control module (ECM) terminal #A1 (#A1) and throttle unit terminal #6 (wiring side). Check for an open-circuit. Check the signal cable (potentiometer 2) between engine control module (ECM) terminal #A20 (#A20) and throttle unit terminal #5 (wiring side). Check for an open-circuit. Check the signal cables (potentiometer 1) terminal #A1 (#A1) and (potentiometer 2) terminal #A20 (#A20). Check for a short-circuit to each other. HINT: With the ignition on, the power supply to the throttle unit potentiometers must be approximately 5 V measured between throttle unit connector terminals #2 and #3 (wiring side). If no faults are found during the checks and the diagnostic trouble code (DTC) recurs, try replacing the throttle unit. NOTE: When replacing the throttle unit, the throttle unit must be adapted. See «Adaptation of the throttle unit»(ref-430993-S07361583752012011600000) . Remedy as necessary. Other information: See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) For resistance values: For turbocharged engines 2001, see «Component specifications»(ref-430975-S12681654262011101900000) . For turbocharged engines 2002, see «Component specifications»(ref-430975-S24294221072011101900000) . For turbocharged engines 2003-, see «Component specifications»(ref-430975-S37637200832011101900000) . For B5254T4 2004-, see «Component specifications»(ref-430975-S19541977602011101900000) . For normally aspirated engines 1999-, see «Component specifications»(ref-451848-S36406831262012020900000) . To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000) For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) . To access or replace the throttle unit: For B5xx4T -2001, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S23357003322011101900000) . For B5xx4T 2002-2004, see «Replacing the throttle body (TB)»(ref-430985-S29652099132011101900000) . For B5xx4T 2005-, B5244T5 and B5254T4 do not apply, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S35865188232011101900000) . For B5254T4 and B5244T5 2004-, see «Throttle body (electronic throttle module (ETM)), replacing (B5254T4 and B5244T5 2004-)»(ref-430993-S23494846432012011600000) .

1. Continue Refer to «Verification»(ref-430993-S00019358472011101900000)

1. Ignition off. Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation. Check the resistance values of the potentiometers in the throttle unit. Check the signal ground cable between engine control module (ECM) terminal #A19 (#A19) and throttle unit terminal #2 (wiring side). Check for an open-circuit. HINT: With the ignition on, the power supply to the throttle unit potentiometers must be approximately 5 V measured between throttle unit connector terminals #2 and #3 (wiring side). Check the signal cable (potentiometer 1) between engine control module (ECM) terminal #A1 (#A1) and throttle unit terminal #6 (wiring side). Check for an open-circuit. Check for a short-circuit to supply voltage. If no faults are found during the checks and the diagnostic trouble code (DTC) recurs, try replacing the throttle unit. NOTE: When replacing the throttle unit, the throttle unit must be adapted. See «Adaptation of the throttle unit»(ref-430993-S07361583752012011600000) . Remedy as necessary. Other information: See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) For resistance values: For turbocharged engines 2001, see «Component specifications»(ref-430975-S12681654262011101900000) . For turbocharged engines 2002, see «Component specifications»(ref-430975-S24294221072011101900000) . For turbocharged engines 2003-, see «Component specifications»(ref-430975-S37637200832011101900000) . For B5254T4 2004-, see «Component specifications»(ref-430975-S19541977602011101900000) . For normally aspirated engines 1999-, see «Component specifications»(ref-451848-S36406831262012020900000) . To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000) For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) . To access or replace the throttle unit: For B5xx4T -2001, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S23357003322011101900000) . For B5xx4T 2002-2004, see «Replacing the throttle body (TB)»(ref-430985-S29652099132011101900000) . For B5xx4T 2005-, B5244T5 and B5254T4 do not apply, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S35865188232011101900000) . For B5254T4 and B5244T5 2004-, see «Throttle body (electronic throttle module (ETM)), replacing (B5254T4 and B5244T5 2004-)»(ref-430993-S23494846432012011600000) .

1. Continue Refer to «Verification»(ref-430993-S35355884512011101900000)

1. Ignition off. Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation. Check the resistance values of the potentiometers in the throttle unit. Check the power supply cable (5 volts) between engine control module (ECM) terminal #A59 (#A59) and throttle unit terminal #3 (wiring side). Check for an open-circuit. Check for a short-circuit to ground. HINT: With the ignition on, the power supply to the throttle unit potentiometers must be approximately 5 V measured between throttle unit connector terminals #2 and #3 (wiring side). Check the signal cable (potentiometer 1) between engine control module (ECM) terminal #A1 (#A1) and throttle unit terminal #6 (wiring side). Check for a short-circuit to ground. If no faults are found during the checks and the diagnostic trouble code (DTC) recurs, try replacing the throttle unit. NOTE: When replacing the throttle unit, the throttle unit must be adapted. See «Adaptation of the throttle unit»(ref-430993-S07361583752012011600000) . Remedy as necessary. Other information: See «Checking wiring and terminals»(ref-430909-S26456997912011101900000) For resistance values: For turbocharged engines 2001, see «Component specifications»(ref-430975-S12681654262011101900000) . For turbocharged engines 2002, see «Component specifications»(ref-430975-S24294221072011101900000) . For turbocharged engines 2003-, see «Component specifications»(ref-430975-S37637200832011101900000) . For B5254T4 2004-, see «Component specifications»(ref-430975-S19541977602011101900000) . For normally aspirated engines 1999-, see «Component specifications»(ref-451848-S36406831262012020900000) . To connect the breakout box, see «Connecting the breakout box»(ref-430911-S30587875092011101900000) For information about signals: For turbocharged engines -2001, see «Signal specification»(ref-430975-S34273110602011101900000) For turbocharged engines 2002, see «Signal specification»(ref-430975-S11230688812011101900000) For B5254T2 -2004, see «Signal description»(ref-430975-S13000059482011101900000) For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see «Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)»(ref-430993-S39229555932012011600000) For B5254T4 2004, see «Signal specification (B5254T4 2004)»(ref-430993-S15375757242012011600000) For turbocharged engines 2005-, see «Signal specification»(ref-430975-S24350024032011101900000) . To access or replace the throttle unit: For B5xx4T -2001, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S23357003322011101900000) . For B5xx4T 2002-2004, see «Replacing the throttle body (TB)»(ref-430985-S29652099132011101900000) . For B5xx4T 2005-, B5244T5 and B5254T4 do not apply, see «Throttle body (electronic throttle module (ETM)), replacing»(ref-430985-S35865188232011101900000) . For B5254T4 and B5244T5 2004-, see «Throttle body (electronic throttle module (ETM)), replacing (B5254T4 and B5244T5 2004-)»(ref-430993-S23494846432012011600000) .

1. Continue Refer to «Verification»(ref-430993-S39092105752011101900000)