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Engine Controls - System & Component Testing: Diagnosis Infiniti M45 II

Testing & Diagnostics 10 illustrations ~5573 words

Diagnostic Procedure (FX45)

  1. Check overall function. Start engine and warm it up to normal operating temperature, and proceed accordingly: With CONSULT-II - Perform VIAS SOL VALVE in ACTIVE TEST mode. Turn VIAS control solenoid valve ON and OFF, and ensure that power valve actuator rod moves. (Scheme 21) If results are as specified, inspection is complete. If results are not as specified, go to next step. Without CONSULT-II - Ensure that power valve actuator rod moves when changing the gear position to "N" and "D" alternately. (Scheme 21) If results are as specified, inspection is complete. If results are not as specified, go to step 3.
  2. Stop engine and disconnect vacuum hose connected to power valve actuator. Start engine and let it idle. Using CONSULT-II, perform VIAS SOL VALVE in ACTIVE TEST mode with CONSULT-II. Turn VIAS control solenoid valve ON and OFF, and check vacuum existence. If VIAS SOL VALVE is ON, vacuum should exist. If VIAS SOL VALVE is OFF, vacuum should not exist. If results are as not specified, repair or replace power valve actuator. If results are as specified, go to step 4.
  3. Stop engine and disconnect vacuum hose connected to power valve actuator. Start engine and let it idle. Apply 12 volts between VIAS control solenoid valve terminals No. 1 and 2. (Scheme 22) Check vacuum existence under the following conditions. If 12 volts is applied, vacuum should exist. If voltage is not applied, vacuum should not exist. If results are not as specified, repair or replace power valve actuator. If results are as specified, go to next step.
  4. Stop engine, check hoses and tubes between intake manifold and power valve actuator for cracks, clogging, improper connection or disconnection. If no problem is found, go to next step. If problem is found, repair as necessary.
  5. Check vacuum tank. Repair or replace as necessary. Go to next step.
  6. Turn ignition switch to OFF position. Disconnect VIAS control solenoid valve harness connector. Turn ignition switch to ON position. Check voltage between terminal No. 1 and ground. Battery voltage should exist. (Scheme 21) If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
  7. Check the following: Harness connectors E211 and M41. Harness connectors M82 and F102. IPDM E/R connector E7. 10-amp fuse. Harness continuity between IPDM E/R and VIAS control solenoid valve. Repair harness or connectors as necessary.
  8. Turn ignition switch to OFF position. Disconnect ECM harness connector. Check harness continuity between ECM terminal No. 29 and terminal No. 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Check harness for short to ground and short to power. If no problem is found, go to next step. If problem is found, repair harness or connectors as necessary.
  9. Check VIAS control solenoid valve. If results are as specified, go to next step. If results are not as specified, replace VIAS control solenoid valve. With CONSULT-II - Reconnect disconnected harness connectors. Turn ignition switch to ON position. Perform VIAS SOL VALVE in ACTIVE TEST mode. Check air passage continuity and operation delay time. If VIAS SOL VALVE is ON, air passage continuity between "A" and "B" should exist, and air passage continuity between "A" and "C" should not exist. (Scheme 22) If VIAS SOL VALVE is OFF, air passage continuity between "A" and "B" should not exist, and air passage continuity between "A" and "C" should exist. With GST - Check air passage continuity and operation delay time under the following conditions. If 12 volts is applied between terminals No. 1 and 2, air passage continuity between "A" and "B" should exist, and air passage continuity between "A" and "C" should not exist. (Scheme 22) If no voltage is applied, there will be no air passage continuity between "A" and "B", but there will be air passage continuity between "A" and "C".
  10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 18

Scheme 18: Diagnostic Procedure (I35)
Scheme 18: Diagnostic Procedure (I35)

Scheme 19

Scheme 19
Scheme 19

Scheme 20

Scheme 20
Scheme 20
  1. Turn ignition switch to OFF position. Disconnect VIAS control solenoid valve harness connector. (Scheme 18) Turn ignition switch to ON position. Check voltage between terminal No. 1 and ground with CONSULT-II or tester. Battery voltage should exist. If voltage is as specified, go to step 3. If voltage is not as specified, go to next step.
  2. Check the following: Harness connectors M229 and F66. Fuse block (J/B) connector M19. 15-amp fuse. Harness continuity between fuse and VIAS control solenoid valve. Repair harness or connectors.
  3. Turn ignition switch to OFF position. Disconnect ECM harness connectors. Check harness continuity between ECM terminal No. 27 and terminal No. 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also check harness for short to ground and short to power. If results are as specified, go to next step. If results are not as specified, repair open circuit or short to ground or short to power in harness or connectors.
  4. Check VIAS control solenoid valve accordingly. With CONSULT-II - Reconnect disconnected harness connector. Turn ignition switch to ON position. Perform VIAS SOL VALVE in ACTIVE TEST mode. Check air passage continuity and operation delay time under the following conditions. (Scheme 19) If results are as specified, go to next step. If results are not as specified, replace VIAS control solenoid valve. Without CONSULT-II - Check air passage continuity and operation delay time under the specified conditions. (Scheme 20) If results are as specified, go to next step. If results are not as specified, replace VIAS control solenoid valve.
  5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If results are as specified, inspection is complete.

Diagnostic Procedure (M45 & Q45)

  1. Check overall function. Start engine and warm it up to normal operating temperature, and proceed accordingly: With CONSULT-II - Perform VIAS SOL VALVE in ACTIVE TEST mode. Turn VIAS control solenoid valve ON and OFF, and ensure that power valve actuator rod moves. (Scheme 21) If results are as specified, inspection is complete. If results are not as specified, go to next step. Without CONSULT-II - Ensure that power valve actuator rod moves when changing the gear position to "N" and "D" alternately. (Scheme 21) If results are as specified, inspection is complete. If results are not as specified, go to step 3.
  2. Stop engine and disconnect vacuum hose connected to power valve actuator. Check vacuum existence, and proceed accordingly: With CONSULT-II - Perform VIAS SOL VALVE in ACTIVE TEST mode with CONSULT-II. Turn VIAS control solenoid valve ON and OFF, and check vacuum existence under the following conditions. If VIAS SOL VALVE is ON, vacuum should exist. If VIAS SOL VALVE is OFF, vacuum should not exist. If results are as specified, repair or replace power valve actuator. If results are not as specified, go to step 4. Without CONSULT-II -Disconnect VIAS control solenoid valve harness connector. Start engine and let it idle. Apply 12 volts between VIAS control solenoid valve terminals No. 1 and 2. (Scheme 22) Check for vacuum under the following conditions. If 12 volts is applied, vacuum should exist. If voltage is not applied, vacuum should not exist. If results are as specified, repair or replace power valve actuator. If results are as specified, go to step 4.
  3. Stop engine, check hoses and tubes between intake manifold and power valve actuator for cracks, clogging, improper connection or disconnection. If no mproblem is found, go to step 5. If problem is found, repair as necessary.
  4. Check vacuum tank. Repair or replace as necessary. Go to next step.
  5. Turn ignition switch to OFF position. Disconnect VIAS control solenoid valve harness connector. (Scheme 21) Turn ignition switch to ON position. Check voltage between terminal No. 1 and ground with CONSULT-II or tester. Battery voltage should exist. (Scheme 21) If voltage is as specified, go to step 7. If voltage is not as specified, go to next step.
  6. Check the following: Harness connectors E33 and F33. Fuse, fusible link and relay block (J/B) connector E3. 10-amp fuse. Harness continuity between fuse and VIAS control solenoid valve. Repair harness or connectors as necessary.
  7. Turn ignition switch to OFF position. Disconnect ECM harness connector. Check harness continuity between ECM terminal No. 27 and terminal No. 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also check harness for short to ground and short to power. If no problem is found, go to next step. If problem is found, repair harness or connectors as necessary.
  8. Check VIAS control solenoid valve. If results are as specified, go to next step. If results are not as specified, replace VIAS control solenoid valve. With CONSULT-II - Reconnect harness connectors disconnected. Turn ignition switch to ON position. Perform VIAS SOL VALVE in ACTIVE TEST mode. Check air passage continuity and operation delay time. If VIAS SOL VALVE is on, air passage continuity between "A" and "B" should exist, and air passage continuity between "A" and "C" should not exist. (Scheme 22) If VIAS SOL VALVE is off, air passage continuity between "A" and "B" should not exist, and air passage continuity between "A" and "C" should exist. With GST - Check air passage continuity and operation delay time under the following conditions. If 12 volts is applied between terminals No. 1 and 2, air passage continuity between "A" and "B" should exist, and air passage continuity between "A" and "C" should not exist. If voltage is not applied, there will be no air passage continuity between "A" and "B", but there will be air passage continuity between "A" and "C". (Scheme 22)
  9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22

Diagnostic Procedure (QX4)

  1. Check overall function. Start engine and warm it up to normal operating temperature, and proceed accordingly: With CONSULT-II - Perform VIAS SOL VALVE in ACTIVE TEST mode. Turn VIAS control solenoid valve on and off, and ensure that power valve actuator rod moves. (Scheme 21) If power valve actuator rod moves, inspection is complete. If power valve actuator rod does not move, go to next step. Without CONSULT-II - Quickly rev engine to 5,000 RPM and then let engine return to idle. Ensure that power valve actuator rod moves. (Scheme 21) If power valve actuator rod moves, inspection is complete. If power valve actuator rod does not move, go to next step.
  2. Stop engine and disconnect vacuum hose connected to power valve actuator. Check vacuum existence, and proceed accordingly: With CONSULT-II - Perform VIAS SOL VALVE in ACTIVE TEST mode with CONSULT-II. Turn VIAS control solenoid valve ON and OFF, and check vacuum existence under the following conditions. If VIAS SOL VALVE is ON, vacuum should exist. If VIAS SOL VALVE is OFF, vacuum should not exist. If results are as specified, repair or replace power valve actuator. If results are not as specified, go to next step. Without CONSULT-II -Disconnect VIAS control solenoid valve harness connector. Start engine and let it idle. Apply 12 volts between VIAS control solenoid valve terminals No. 1 and 2. (Scheme 22) See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check vacuum existence under the following conditions. If 12 volts is applied, vacuum should exist. If no voltage is applied, vacuum should not exist. If results are not as specified, repair or replace power valve actuator. If results are as specified, go to next step.
  3. Stop engine, check hoses and tubes between intake manifold and power valve actuator for cracks, clogging, improper connection or disconnection. If no problem is found, go to next step. If problem is found, repair as necessary.
  4. Disconnect vacuums hoses from vacuum tank. Using vacuum pump, apply vacuum to tank port "A". Attach vacuum gauge to port "B" and ensure that vacuum is maintained. If vacuum is not maintained, replace vacuum tank. If vacuum is maintained, go to next step.
  5. Turn ignition switch to OFF position. Disconnect VIAS control solenoid valve harness connector. Turn ignition switch to ON position. Check voltage between terminal No. 1 and ground with CONSULT-II or tester. (Scheme 21) See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Battery voltage should exist. If voltage is as specified, go to step 7. If voltage is not as specified, go to next step.
  6. Check the following: Harness connectors M32 and F23. Fuse (J/B) connector M10. 10-amp fuse. Harness continuity between fuse and VIAS control solenoid valve. Repair harness or connectorsas necessary.
  7. Turn ignition switch to OFF position. Disconnect ECM harness connector. Check harness continuity between ECM terminal No. 16 and terminal No. 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also check harness for short to ground and short to power. If problem is found, repair circuits or connectors as necessary. If problem is not found, go to next step.
  8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

POWER STEERING PRESSURE (PSP) SWITCH SYSTEM TEST

Note. Power steering pressure switch may also be referred to as power steering pressure sensor.

EVAP System Leak Test

CAUTIONDO NOT use compressed air. DO NOT start engine. DO NOT apply more than.6 psi (4.12 kPa) of pressure to EVAP system.
  1. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 23) Connect a suitable pressure pump to adapter. DO NOT use compressed air. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
  2. Turn ignition switch to ON position. Select EVAP SYSTEM CLOSE of WORK SUPPORT mode with CONSULT-II. Press START. Observe pressure indicator on CONSULT-II. Apply pressure to EVAP system until pressure indicator reaches middle of bar graph. DO NOT exceed.6 psi (4.12 kPa) of pressure. Using Leak Detector (J41416), locate EVAP leak. See «VACUUM DIAGRAMS»(ref-151813) article.
  3. Disconnect EVAP Canister Vent Control Valve (EVAP-CVCV) and vacuum cut valve by-pass valve harness connectors. (Scheme 24) Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. Apply.2-.4 psi (1.38-2.76 kPa) of pressure to EVAP service port. DO NOT exceed.6 psi (4.12 kPa) of pressure. Remove pressure pump from EVAP service port. Using Leak Detector (J41416), locate EVAP system leak. See «VACUUM DIAGRAMS»(ref-151813) article.

Scheme 23

Scheme 23
Scheme 23

Scheme 24

Scheme 24
Scheme 24

EVAP Canister Test

Remove EVAP canister. Plug vent hose and blow air into port "A". Air should flow freely out of port "B". (Scheme 25) Replace EVAP canister if operation is not as specified.

Scheme 25

Scheme 25: EVAP Canister Test
Scheme 25: EVAP Canister Test

Refueling Control Valve Test

  1. Remove fuel filler cap. Disconnect signal line hose from fuel filler tube. Disconnect refueling EVAP vapor line hose from tube. (Scheme 26)
  2. Leave both hoses connected to fuel tank. Blow air into refueling EVAP vapor line hose. Air should flow freely into fuel tank. Blow air into signal line hose. Air should not flow. Using a hand pressure pump with a "T", apply 2.9 psi (20.0 kPa) of pressure to both hoses. (Scheme 27) Air should not leak. If operation is as specified, refueling control valve is okay. If operation is not as specified, replace fuel tank.

Scheme 26

Scheme 26
Scheme 26

Scheme 27

Scheme 27
Scheme 27

Refueling EVAP Vapor Cut Valve Test

  1. Remove fuel tank. Remove fuel level sensor unit retainer. Drain fuel from tank using a hand pump. To check if refueling EVAP vapor cut valve is stuck closed, blow air into refueling EVAP vapor line. (Scheme 26) If air flows freely into fuel tank, go to next step. If air does not flow freely into fuel tank, replace fuel tank.
  2. To check if refueling EVAP vapor cut valve is stuck open, connect a vacuum pump with a "T" to signal line and refueling EVAP vapor line. (Scheme 27) Remove fuel gauge/fuel level sensor unit. Invert fuel tank. Apply 3.94 in. Hg (13.3 kPa) of vacuum to signal line and refueling EVAP vapor line. If vacuum does not hold with fuel tank upside down, replace fuel tank. If vacuum holds with fuel tank upside down, refueling EVAP vapor cut valve is okay.

Diagnostic Procedure (FX35)

  1. Start engine and warm to normal operating temperature. Turn A/C switch and blower switch to ON position. Measure voltage between ground and ECM terminal No. 70 by backprobing. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be 1-4 volts. If voltage is as specified, system is okay. If voltage is not as specified, go to next step.
  2. Turn A/C switch and blower switch to OFF position. Turn ignition switch to OFF position. Disconnect refrigerant pressure sensor harness connector located in front of condenser. Turn ignition switch to ON position. Measure voltage between ground and refrigerant pressure sensor harness connector terminal No. 1. Voltage should be about 5 volts. If voltage is as specified, go to step 4 . If voltage is not as specified, go to next step.
  3. Check the following: Check harness connectors E18 and F48. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  4. Turn ignition switch to OFF position. Check continuity between engine ground and refrigerant pressure sensor harness connector terminal No. 3. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6 .
  5. Check the following: Check harness connectors E18 and F48. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  6. Disconnect ECM harness connector. Check continuity between refrigerant pressure sensor harness connector terminal No. 2 and ECM harness connector terminal No. 70. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If no problem is found, go to step 8 .
  7. Check the following: Check harness connectors E18 and F48. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  8. No problem is indicated at this time. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, replace refrigerant pressure sensor.
  1. Start engine and warm to normal operating temperature. Turn A/C switch and blower switch to ON position. Measure voltage between ground and ECM terminal No. 70 by backprobing. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be 1-4 volts. If voltage is as specified, system is okay. If voltage is not as specified, go to next step.
  2. Turn A/C switch and blower switch to OFF position. Turn ignition switch to OFF position. Disconnect refrigerant pressure sensor harness connector located in front of condenser. Turn ignition switch to ON position. Measure voltage between ground and refrigerant pressure sensor harness connector terminal No. 1. Voltage should be about 5 volts. If voltage is as specified, go to step 4 . If voltage is not as specified, go to next step.
  3. Check the following: Check ness connectors E17 and F47. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  4. Turn ignition switch to OFF position. Check continuity between engine ground and refrigerant pressure sensor harness connector terminal No. 3. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6 .
  5. Check the following: Check harness connectors E17 and F47. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  6. Disconnect ECM harness connector. Check continuity between refrigerant pressure sensor harness connector terminal No. 2 and ECM harness connector terminal No. 70. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If no problem is found, go to step 8 .
  7. Check the following: Check harness connectors E17 and F47. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  8. No problem is indicated at this time. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, replace refrigerant pressure sensor.

Diagnostic Procedure (G35)

  1. Start engine and warm to normal operating temperature. Turn A/C switch and blower switch to ON position. Measure voltage between ground and ECM terminal No. 81 by backprobing. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be 1-4 volts. If voltage is as specified, system is okay. If voltage is not as specified, go to next step.
  2. Turn A/C switch and blower switch to OFF position. Turn ignition switch to OFF position. Disconnect refrigerant pressure sensor harness connector located in front of condenser. Turn ignition switch to ON position. Measure voltage between ground and refrigerant pressure sensor harness connector terminal No. 1. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be about 5 volts. If voltage is as specified, go to step 4 . If voltage is not as specified, go to next step.
  3. Check the following: Check for harness connectors E12 and F3. Joint connector-1. Joint connector-4. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  4. Turn ignition switch to OFF position. Check continuity between engine ground and refrigerant pressure sensor harness connector terminal No. 3. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6 .
  5. Check the following: Check harness connectors E10 and F1. Joint connector-3. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  6. Disconnect ECM harness connector. Check continuity between refrigerant pressure sensor harness connector terminal No. 2 and ECM harness connector terminal No. 81. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If no problem is found, go to step 8 .
  7. Check the following: Check harness connectors E10 and F1. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  8. No problem is indicated at this time. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, replace refrigerant pressure sensor.

Diagnostic Procedure (I35)

  1. Start engine and warm to normal operating temperature. Turn A/C switch and blower switch to ON position. Measure voltage between ground and ECM terminal No. 81 by backprobing. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be 1-4 volts. If voltage is as specified, system is okay. If voltage is not as specified, go to next step.
  2. Turn A/C switch and blower switch to OFF position. Turn ignition switch to OFF position. Disconnect refrigerant pressure sensor harness connector located in front of condenser. Turn ignition switch to ON position. Measure voltage between ground and refrigerant pressure sensor harness connector terminal No. 1. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If voltage is about 5 volts, go to step 4 . If voltage is not about 5 volts, go to next step.
  3. Check the following: Harness connectors E15 and F18. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  4. Turn ignition switch to OFF position. Check harness continuity between engine ground and refrigerant pressure sensor harness connector terminal No. 3. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6 .
  5. Check the following: Harness connectors E8 and F17. Check for open or short between refrigerant pressure sensor and ECM. Check for open or short between Transmission Control Module (TCM) and refrigerant pressure sensor. Repair as necessary.
  6. Disconnect ECM harness connector. Check harness continuity between refrigerant pressure sensor harness connector terminal No. 2 and ECM harness connector terminal No. 81. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If circuit is okay, go to step 8 .
  7. Check the following: Harness connectors E1 and M1. Harness connectors E8 and F17. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  8. No problem is indicated at this time. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary.

Diagnostic Procedure (M45)

  1. Start engine and warm to normal operating temperature. Turn A/C switch and blower switch to ON position. Measure voltage between ground and ECM terminal No. 88 (Pink wire) by backprobing. See. Voltage should be 1-4 volts. If voltage is as specified, system is okay. If voltage is not as specified, go to next step.
  2. Turn A/C switch and blower switch to OFF position. Turn ignition switch to OFF position. Disconnect refrigerant pressure sensor harness connector located in front of condenser. Turn ignition switch to ON position. Measure voltage between ground and refrigerant pressure sensor harness connector terminal No. 1 (Blue wire). If voltage is about 5 volts, go to step 4 . If voltage is not about 5 volts, go to next step.
  3. Check the following: Check for open or short between refrigerant pressure sensor and ECM. Check for poor connections at ECM and refrigerant pressure sensor harness connectors. Repair as necessary.
  4. Turn ignition switch to OFF position. Check continuity between engine ground and refrigerant pressure sensor harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6 .
  5. Check the following: Check for poor connections at ECM and refrigerant pressure sensor harness connectors. Check joint connector-30. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  6. Disconnect ECM harness connector. Check continuity between refrigerant pressure sensor harness connector terminal No. 2 (Pink wire) and ECM harness connector terminal No. 88 (Pink wire). Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If circuit is okay, go to step 8 .
  7. Check the following: Check for poor connection at ECM and refrigerant pressure sensor harness connectors. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary.
  8. No problem is indicated at this time. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, replace refrigerant pressure sensor.

Diagnostic Procedure (Q45)

  1. Start engine and warm to normal operating temperature. Turn A/C switch and blower switch to ON position. Measure voltage between ground and ECM terminal No. 88 by backprobing. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be 1-4 volts. If voltage is as specified, system is okay. If voltage is not as specified, go to next step.
  2. Turn A/C switch and blower switch to OFF position. Turn ignition switch to OFF position. Disconnect refrigerant pressure sensor harness connector located in front of condenser. Turn ignition switch to ON position. Measure voltage between ground and refrigerant pressure sensor harness connector terminal No. 1 (Blue wire). See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If voltage is about 5 volts, go to step 4 . If voltage is not about 5 volts, go to next step.
  3. Check the following: Check for poor connection at connectors F33 and E33. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  4. Turn ignition switch to OFF position. Check continuity between engine ground and refrigerant pressure sensor harness connector terminal No. 3 (Black wire). See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6 .
  5. Check the following: Check for poor connection at connector F33 and E33. Joint connector No. 30. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  6. Disconnect ECM harness connector. Check harness continuity between refrigerant pressure sensor harness connector terminal No. 2 (Pink wire) and ECM harness connector terminal No. 88 (Pink wire). See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If circuit is okay, go to step 8 .
  7. Check the following: Check for poor connection at connectors F33 and E33. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  8. No problem is indicated at this time. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, replace refrigerant pressure sensor.
  1. Start engine and warm to normal operating temperature. Turn A/C switch and blower switch to ON position. Measure voltage between ground and ECM terminal No. 81 by backprobing. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Voltage should be 1-4 volts. If voltage is as specified, system is okay. If voltage is not as specified, go to next step.
  2. Turn A/C switch and blower switch to OFF position. Turn ignition switch to OFF position. Disconnect refrigerant pressure sensor harness connector located in front of condenser. Turn ignition switch to ON position. Measure voltage between ground and refrigerant pressure sensor harness connector terminal No. 3. See AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If voltage is about 5 volts, go to step 4 . If voltage is not about 5 volts, go to next step.
  3. Check the following: Harness connectors E1 and M1. Harness connectors M94 and F27. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  4. Turn ignition switch to OFF position. Check harness continuity between engine ground and refrigerant pressure sensor harness connector terminal No. 1. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6 .
  5. Check the following: Harness connectors E1 and M1. Harness connectors M33 and F22. Check for open or short between refrigerant pressure sensor and ECM. Check for open between refrigerant pressure sensor and Transmission Control Module (TCM). Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  6. Disconnect ECM harness connector. Check harness continuity between refrigerant pressure sensor harness connector terminal No. 2 and ECM harness connector terminal No. 81. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If circuit is okay, go to step 8 .
  7. Check the following: Harness connectors E1 and M1. Harness connectors M94 and F27. Check for open or short between refrigerant pressure sensor and ECM. Repair as necessary. See ENGINE PERFORMANCE and AIR CONDITIONING in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  8. No problem is indicated at this time. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, replace refrigerant pressure sensor.

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