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Engine Control Module (ECM) Diagnostic Trouble Codes - 9 of 13: Wiring Volvo XC90 I facelift

Testing & Diagnostics 4 illustrations ~2557 words

CHECKING THE COMPONENT AND WIRING

  1. Ignition off.
  2. Check the external temperature sensor connector and terminals. Check for contact resistance. Check for oxidation.
  3. Ignition on. Read off the external temperature using the VCT2000 (or appropriate scan tool). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see SENSORS FOR CHECK AND WARNING SYSTEM see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

CHECKING COMPONENTS AND WIRING

  1. Ignition off Check the signal cables. Check for a short-circuit to supply voltage. Check the signal cables for open circuit. Check between: Engine control module (ECM) #B29 (#C29) and outdoor temperature sensor's connector #1, signal cable (+). Engine control module (ECM) #B9 (#C9) and outdoor temperature sensor's connector #2, signal cable (-). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see SENSORS FOR CHECK AND WARNING SYSTEM see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

HINT: Bank 1 (cylinder row nearest the front): cylinders 1, 3, 5 and 7. Bank 2 (cylinder row furthest to the rear, nearest the passenger compartment): cylinders 2, 4, 6, and 8.

Scheme 316

Scheme 316
Scheme 316

Scheme 317

Scheme 317
Scheme 317
  1. Ignition off Check the fuse for the circuit. If the fuse is blown, check the cable for short-circuit to ground. Check changeover valve resistance. Disconnect the engine control module (ECM). Check the signal cable of the relevant changeover valve camshaft for open-circuit. Measure between: Control module #A87 (#B27) and reset valve camshaft #2, inlet (bank 1). Control module #A86 (#B26) and reset valve camshaft #2, inlet (bank 2). Check the power cable of the relevant changeover valve camshaft for open-circuit. Measure between: System relay and reset valve camshaft #1, inlet (bank 1). System relay and reset valve camshaft #1, inlet (bank 2). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) For B5xx4T, see VARIABLE VALVE TIMING SOLENOID, REPLACING For B6xx4T, see REPLACING THE VARIABLE VALVE TIMING SOLENOID . see COMPONENT SPECIFICATIONS see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

HINT: Bank 1 (cylinder row nearest the front): cylinders 1, 3, 5 and 7. Bank 2 (cylinder row furthest to the rear, nearest the passenger compartment): cylinders 2, 4, 6, and 8.

  1. Ignition off Check the fuse for the circuit. If the fuse is blown, check the cable. Check for a short-circuit to ground. Check the resistance of the reset valve. Check the connector for relevant camshaft reset valve. Check for contact resistance and oxidation. Disconnect the engine control module (ECM). Check the signal cable for the relevant camshaft reset valve. Check for a short-circuit to ground. Measure between: Control module #A87 (#B27) and reset valve camshaft #2, inlet (bank 1). Control module #A86 (#B26) and reset valve camshaft #2, inlet (bank 2). Check the voltage supply cable for the relevant camshaft reset valve. Check for a short-circuit to supply voltage. Measure between: System relay and reset valve camshaft #1, inlet (bank 1). System relay and reset valve camshaft #1, inlet (bank 2). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see COMPONENT SPECIFICATIONS For B5xx4T, see VARIABLE VALVE TIMING SOLENOID, REPLACING For B6xx4T, see REPLACING THE VARIABLE VALVE TIMING SOLENOID . see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

HINT: Bank 1 (cylinder row nearest the front): cylinders 1, 3, 5 and 7. Bank 2 (cylinder row furthest to the rear, nearest the passenger compartment): cylinders 2, 4, 6, and 8.

  1. Ignition off Disconnect the engine control module (ECM). Check the signal cable for the relevant camshaft reset valve. Check for a short-circuit to supply voltage. Measure between: Control module #A87 (#B27) and reset valve camshaft #2, inlet (bank 1). Control module #A86 (#B26) and reset valve camshaft #2, inlet (bank 2). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see COMPONENT SPECIFICATIONS For B5xx4T, see VARIABLE VALVE TIMING SOLENOID, REPLACING For B6xx4T, see REPLACING THE VARIABLE VALVE TIMING SOLENOID . see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off Check the fuse for the circuit. If the fuse is blown, check the cable. Check for a short-circuit to ground. Check the resistance of the reset valve. Disconnect the engine control module (ECM). Check the signal cable for the relevant camshaft reset valve. Check for an open-circuit. Measure between: Control module #A91 (#B31) and reset valve camshaft #2, exhaust (bank 1). Control module #A90 (#B30) and reset valve camshaft #2, exhaust (bank 2). Check the voltage supply cable for the relevant camshaft reset valve. Check for an open-circuit. Measure between: System relay and reset valve camshaft #1, exhaust (bank 1). System relay and reset valve camshaft #1, exhaust (bank 2). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see COMPONENT SPECIFICATIONS For B5xx4T, see VARIABLE VALVE TIMING SOLENOID, REPLACING For B6xx4T, see REPLACING THE VARIABLE VALVE TIMING SOLENOID . see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

HINT: Bank 1 (cylinder row nearest the front): cylinders 1, 3, 5 and 7. Bank 2 (cylinder row furthest to the rear, nearest the passenger compartment): cylinders 2, 4, 6, and 8.

  1. Ignition off Check the fuse for the circuit. If the fuse is blown, check the cable. Check for a short-circuit to ground. Check the connector for relevant camshaft reset valve. Check for contact resistance and oxidation. Check the resistance of the reset valve. Disconnect the engine control module (ECM). Check the signal cable for the relevant camshaft reset valve. Check for a short-circuit to ground. Measure between: Control module #A91 (#B31) and reset valve camshaft #2, exhaust (bank 1). Control module #A90 (#B30) and reset valve camshaft #2, exhaust (bank 2). Check the voltage supply cable for the relevant camshaft reset valve. Check for a short-circuit to supply voltage. Measure between: System relay and reset valve camshaft #1, exhaust (bank 1). System relay and reset valve camshaft #1, exhaust (bank 2). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) For B5xx4T, see VARIABLE VALVE TIMING SOLENOID, REPLACING For B6xx4T, see REPLACING THE VARIABLE VALVE TIMING SOLENOID . see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

HINT: Bank 1 (cylinder row nearest the front): cylinders 1, 3, 5 and 7. Bank 2 (cylinder row furthest to the rear, nearest the passenger compartment): cylinders 2, 4, 6, and 8.

  1. Ignition off Disconnect the engine control module (ECM). Check the signal cable for the relevant camshaft reset valve. Check for a short-circuit to supply voltage. Measure between: Control module #A91 (#B31) and reset valve camshaft #2, exhaust (bank 1). Control module #A90 (#B30) and reset valve camshaft #2, exhaust (bank 2). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) For B5xx4T, see VARIABLE VALVE TIMING SOLENOID, REPLACING For B6xx4T, see REPLACING THE VARIABLE VALVE TIMING SOLENOID . see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION
  3. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION
  3. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. see FUEL PRESSURE AND TEMPERATURE SENSOR, REPLACING
  4. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. see FUEL PRESSURE AND TEMPERATURE SENSOR, REPLACING
  4. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. see FUEL PRESSURE AND TEMPERATURE SENSOR, REPLACING
  4. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. see FUEL PRESSURE AND TEMPERATURE SENSOR, REPLACING
  4. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. see FUEL PRESSURE AND TEMPERATURE SENSOR, REPLACING
  4. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the fuel pressure sensor's connector for contact resistance and oxidation.

Try with a new fuel pressure sensor if no malfunction is found in the above troubleshooting.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. see FUEL PRESSURE AND TEMPERATURE SENSOR, REPLACING
  4. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off
  2. Disconnect the engine control module (ECM). Check the signal cable. Check for a short-circuit to ground. Check the signal cable with regard to open circuit. Take readings between control module terminal #A70 (#B10) and mass air flow (MAF) sensor terminal #3. Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off
  2. Disconnect the engine control module (ECM). Check the signal cable. Check for a short-circuit supply voltage. Take readings between control module terminal #A70 (#B10) and mass air flow (MAF) sensor terminal #3. Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off
  2. Disconnect the engine control module (ECM). Check the signal cable with regard to short circuit to supply voltage. Check the signal cable with regard to open circuit. Take readings between control module terminal #A69 (#B09) and pressure sensor terminal #1. Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off Check the mass air flow sensor connections for contact resistance and oxidation. Read the air temperature using the VCT2000 (or appropriate scan tool). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION see MASS AIR FLOW SENSOR (MAF) see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off Check the mass air flow sensor connections for contact resistance and oxidation. Read the air temperature using the VCT2000 (or appropriate scan tool). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off
  2. Disconnect the engine control module (ECM). Check the temperature sensor signal cable for short-circuit to ground. Measure between control module terminal #A66 (#B6) and mass air flow sensor terminal #4. Read the air temperature using the VCT2000 (or appropriate scan tool). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off
  2. Disconnect the engine control module (ECM). Check the signal cable. Check for a short-circuit to supply voltage. Check the signal cable with regard to open circuit. Measure between control module terminal #A66 (#B6) and mass air flow sensor terminal #4. Read the air temperature using the VCT2000 (or appropriate scan tool). Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off Check the engine coolant temperature (ECT) sensor connector and terminals. Check for contact resistance and oxidation. Check the engine coolant temperature (ECT) sensor resistance. Take readings between terminals #1 and #2. Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see COMPONENT SPECIFICATIONS see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off
  2. Disconnect the engine control module (ECM). Check the signal cable. Check for a short-circuit to ground. Measure between control module terminal #A68 (#B8) and engine temperature sensor terminal #1. Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off
  2. Disconnect the engine control module (ECM). Check the signal cable with regard to short circuit to supply voltage. Check the signal cable with regard to open circuit. Measure between control module terminal #A68 (#B8) and engine temperature sensor terminal #1. Remedy as necessary. Other information see CONNECTING THE BREAKOUT BOX see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM) see MASS AIR FLOW (MAF) SENSOR, REPLACING see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION

Check the cable between engine control module (ECM) #B24 (#C24) and accelerator pedal position sensor #5 for short-circuit to ground and open circuit.

Check the voltage feed from engine control module (ECM) #B32 (#C32) to accelerator pedal position sensor #6 for open circuit.

Check the ground cable between engine control module (ECM) #B7 (#C7) and accelerator pedal position sensor #4 for open circuit.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. For replacing accelerator pedal position sensor: ACCELERATOR PEDAL (AP), REPLACING
  4. see CHECKING WIRING AND TERMINALS

Scheme 318

Scheme 318
Scheme 318
  1. Continue Refer to VERIFICATION

Check the cable between engine control module (ECM) #B24 (#C24) and accelerator pedal position sensor #5 for short-circuit to voltage.

Remedy as necessary.

Other information

  1. see CONNECTING THE BREAKOUT BOX
  2. see SIGNAL SPECIFICATION, ENGINE CONTROL MODULE (ECM)
  3. For replacing accelerator pedal position sensor: ACCELERATOR PEDAL (AP), REPLACING
  4. see CHECKING WIRING AND TERMINALS
  1. Continue Refer to VERIFICATION
  1. Ignition off.

Check the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation.

Check the engine temperature sensor's resistance between #1 and #2 (against the sensor).

Remedy as necessary.

Other information

  1. see SIGNAL SPECIFICATION
  2. see CONNECTING THE BREAKOUT BOX
  3. see COMPONENT SPECIFICATIONS
  4. see CHECKING WIRING AND TERMINALS

Scheme 319

Scheme 319
Scheme 319
  1. Continue Refer to VERIFICATION

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