Home ReviewsRefund
Home/Nissan/350Z/Nissan 350Z I (2002-2005)/Repair manual/Testing & Diagnostics/Engine Controls - System & Component Testing: Other
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Controls - System & Component Testing: Other Nissan 350Z I

Testing & Diagnostics 269 illustrations ~23183 words

AIR INDUCTION SYSTEMS

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. Also see ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For vacuum diagram identification, see VACUUM DIAGRAMS article. For engine performance related component locations, see appropriate illustration under COMPONENT LOCATIONS .

Altima 2.5L & Sentra 2.5L

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 4.
  2. On CONSULT-II, from ACTIVE TEST mode, select VIAS SOL VALVE. Using CONSULT-II, turn Variable Induction Air Control System (VIAS) On and Off while observing power valve actuator rod. If rod moves as specified, testing is complete. If rod does not move, go to next step.
  3. Turn ignition off. Disconnect vacuum hose to VIAS power valve. Start engine and allow to idle. Check vacuum while using CONSULT-II to turn VIAS On and Off. When VIAS is On vacuum should exist at hose. When VIAS is Off vacuum should not exist. If vacuum exists as specified, repair or replace VIAS power valve actuator. If vacuum does not exist, go to step 6.
  4. Start engine and warm to normal operating temperature. While quickly increasing engine speed to 5000 RPM, check if power valve actuator rod moves. (Scheme 86) If rod moves, testing is complete. If rod does not move, go to next step.
  5. Turn ignition off. Disconnect vacuum hose to VIAS power valve. Disconnect VIAS control solenoid valve 2-pin harness connector. Start engine and allow to idle. Using 2 jumper wires, jumper VIAS control solenoid valve pin No. 1 to battery voltage and pin No. 2 to ground. When voltage is applied to solenoid, vacuum should exist at hose. When voltage is removed, vacuum should not exist. If vacuum exists as specified, repair or replace VIAS power valve actuator. If vacuum does not exist, go to next step.
  6. Turn ignition off. Check for cracks, clogging, poor or disconnected vacuum hoses and tubes between intake manifold and power valve actuator. If no problem is found, go to next step. If problem is found, repair or replace hoses as necessary.
  7. Check vacuum tank. Disconnect vacuum hoses from vacuum storage tank. Storage tank is located on intake manifold. Using hand-held vacuum pump, apply vacuum to one port of storage tank and verify that vacuum exists at other port. If no problem is found, go to next step. If problem is found, replace vacuum storage tank.
  8. Turn ignition off. Disconnect VIAS control solenoid valve 2-pin harness connector. Turn ignition on. Measure voltage between ground and VIAS control solenoid valve harness connector terminal No. 1 (Red/Yellow wire on Altima; Green/White wire on Sentra). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 10.
  9. On Sentra, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E9 and F47. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector E103. Check fuse block fuse No. 20 (10-amp). Check for continuity in Green/White wire between fuse block fuse No. 20 and VIAS control solenoid valve. If problem is found, repair as necessary. After repair, retest system. On Altima, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E130 and E27. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E20 and F32. Check for poor, loose, corroded or damaged terminal connections at Intelligent Power Distribution Module (IPDM) harness connector E124. Check fuse block fuse No. 44 (10-amp). Check for continuity in Red/Yellow wire between fuse block fuse No. 44 and VIAS control solenoid valve.
  10. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87)or (Scheme 88). Check continuity in Yellow/Green wire between VIAS control solenoid valve harness connector terminal No. 2 and ECM harness connector terminal No. 25. (Scheme 90) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. After repair, retest system.
  11. Check VIAS control solenoid valve. See «VIAS CONTROL SOLENOID VALVE»(ref-151938-S33339397792004010800000). If no problem is found, go to next step. If problem is found, replace VIAS control solenoid valve.
  12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 86

Scheme 86
Scheme 86

Scheme 87

Scheme 87
Scheme 87

Scheme 88

Scheme 88
Scheme 88

Scheme 89

Scheme 89
Scheme 89

Scheme 90

Scheme 90
Scheme 90

Altima 3.5L & Maxima

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 4.
  2. On CONSULT-II, from ACTIVE TEST mode, select VIAS SOL VALVE. Using CONSULT-II, turn Variable Induction Air Control System (VIAS) On and Off while observing power valve actuator rod. VIAS power valve is located on front of right cylinder head. If rod moves as specified, testing is complete. If rod does not move, go to next step.
  3. Turn ignition off. Disconnect vacuum hose to VIAS power valve. Start engine and allow to idle. Check vacuum while using CONSULT-II to turn VIAS On and Off. When VIAS is On, vacuum should exist at hose. When VIAS is Off, vacuum should not exist. If vacuum exists as specified, repair or replace VIAS power valve actuator. If vacuum does not exist, go to step 6.
  4. Start engine and warm to normal operating temperature. While quickly increasing engine speed to 5000 RPM, check if power valve actuator rod moves. (Scheme 91)and (Scheme 92). If rod moves, system is okay. If rod does not move, go to next step.
  5. Turn ignition off. Disconnect vacuum hose to VIAS power valve. Disconnect VIAS control solenoid valve 2-pin harness connector. (Scheme 93)and (Scheme 94). Start engine and allow to idle. Using 2 jumper wires, jumper VIAS control solenoid valve pin No. 1 to battery voltage and pin No. 2 to ground. When voltage is applied to solenoid, vacuum should exist at hose. When voltage is removed, vacuum should not exist. If vacuum exists as specified, repair or replace VIAS power valve actuator. If vacuum does not exist, go to next step.
  6. Turn ignition off. Check for cracks, clogging, poor or disconnected vacuum hoses and tubes between intake manifold and power valve actuator. If no problem is found, go to next step. If problem is found, repair or replace hoses as necessary.
  7. Check vacuum tank. Disconnect vacuum hoses from vacuum storage tank. Storage tank is located on intake manifold. Using hand-held vacuum pump apply vacuum to one port of storage tank and verify that vacuum exists at other port. If no problem is found, go to next step. If problem is found, replace vacuum storage tank.
  8. Turn ignition off. Disconnect VIAS control solenoid valve 2-pin harness connector. (Scheme 93)and (Scheme 94). Turn ignition on. Measure voltage between ground and VIAS control solenoid valve harness connector terminal No. 1 (Red/Yellow wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 10.
  9. On Altima, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E130 and E27. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E20 and F32. Check for poor, loose, corroded or damaged terminal connections at Intelligent Power Distribution Module (IPDM) harness connector E124. Check fuse block fuse No. 44 (10-amp). Check for continuity in Red/Yellow wire between fuse block fuse No. 44 and VIAS control solenoid valve. On Maxima, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M161 and F68. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M19. Check fuse block fuse No. 20 (15-amp). Check for continuity in Red/Yellow wire between fuse block fuse and VIAS control solenoid valve.
  10. Turn ignition off. Disconnect ECM harness connector. For ECM locations (Scheme 88)and (Scheme 89). Check continuity of Yellow/Green wire between VIAS control solenoid valve harness connector terminal No. 2 and ECM harness connector terminal No. 27. (Scheme 90) Also, check circuit for short to ground and short to voltage. If problem is found, repair circuit as necessary. After repair, retest system. If no problem is found, go to next step.
  11. Reconnect all harness connectors. Repeat steps 2 or 4 as needed. If power valve actuator rod moves, test is complete. If power valve actuator rod does not move, go to next step.
  12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 91

Scheme 91
Scheme 91

Scheme 92

Scheme 92
Scheme 92

Scheme 93

Scheme 93
Scheme 93

Scheme 94

Scheme 94
Scheme 94

VIAS Control Solenoid Valve (Except Murano & Pathfinder)

  1. With CONSULT-II Disconnect vacuum hoses from VIAS control solenoid valve. Turn ignition on. On CONSULT-II from ACTIVE TEST mode, select VIAS SOL VALVE. Using CONSULT-II, command valve On and Off. Using an auxiliary length of vacuum hose connected to vacuum port " A" blow through valve under specified conditions. See «CHECKING VIAS CONTROL SOLENOID VALVE WITH CONSULT-II»(ref-151938-S36741139122004010800000) table. (Scheme 95) If valve does not test as specified, replace VIAS control solenoid valve. CHECKING VIAS CONTROL SOLENOID VALVE WITH CONSULT-II VIAS Valve Condition Air Passage Continuity Between A & B Air Passage Continuity Between A & C ON Yes No OFF No Yes
  2. Without CONSULT-II Disconnect vacuum hoses from VIAS control solenoid valve. Turn ignition on. Using 2 jumper wires, jumper VIAS control solenoid valve pin No. 1 to battery voltage and pin No. 2 to ground. Using an auxiliary length of vacuum hose connected to vacuum port "A", blow through valve under specified conditions. When voltage is applied to solenoid, air should flow between vacuum ports "A" and "B", and air should not flow between vacuum ports "A" and "C". When voltage is removed from valve, air should flow between vacuum ports "A" and "C", and air should not flow between vacuum ports "A" and "B". (Scheme 95) If valve does not test as specified, replace VIAS control solenoid valve.

Scheme 95

Scheme 95
Scheme 95

COMPUTERIZED ENGINE CONTROLS

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate illustration under COMPONENT LOCATIONS . For vacuum diagram identification, see PIN VOLTAGE CHARTS article.

Power & Ground Circuits (Altima 2.5L)

For ECM power and ground circuit wiring diagram and diagnostic procedure (Scheme 96)- (Scheme 102). If no problem is found, check ignition signal. See IGNITION SIGNAL CIRCUITS under IGNITION SYSTEM. For intermittent diagnosis, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For engine control system component locations see scheme 302- see scheme 305. ECM is located behind glove box. For ECM connector and terminal view (Scheme 90) For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 96

Scheme 96: Power & Ground Circuits (Altima 2.5L)
Scheme 96: Power & Ground Circuits (Altima 2.5L)

Scheme 97

Scheme 97
Scheme 97

Scheme 98

Scheme 98
Scheme 98

Scheme 99

Scheme 99
Scheme 99

Scheme 100

Scheme 100
Scheme 100

Scheme 101

Scheme 101
Scheme 101

Scheme 102

Scheme 102
Scheme 102

Power & Ground Circuits (Altima 3.5L)

  1. Start engine. If engine starts, go to step 6. If engine does not start, go to next step.
  2. Turn ignition off, and then on. Backprobing at ECM, measure voltage between ground and ECM harness connector terminal No. 43 (Red wire). (Scheme 90) If battery voltage exists, go to step 4. If battery voltage does not exist, go to next step.
  3. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M71 and F59. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M4. Check fuse block fuse No. 1 (10-amp). Check for open or short in Red wire between ECM and fuse block. If problem is found, repair as necessary. After repair, retest system.
  4. Turn ignition off. Disconnect ECM 116-pin harness connector. ECM is located behind glove box. (Scheme 88) Check continuity between ground and specified circuits. See «CHECKING ECM GROUND CIRCUITS»(ref-151938-S26262324972004010800000) table. Continuity should exist at each measurement. Also, check each circuit for short to voltage. If no problem is found, connect ECM harness connector and go to next step. If problem is found, repair as necessary. After repair, retest system. CHECKING ECM GROUND CIRCUITS Measure Between Ground & Terminal No. Wire Color 48 Black 57 Black 106 Black 108 Black
  5. Measure voltage between ground and ECM harness connector terminal No. 31 (Red wire). If battery voltage exists, check ignition signal. Perform appropriate procedure under «IGNITION SIGNAL CIRCUITS»(ref-151938-S14853014092004010800000). If battery voltage does not exist, go to next step.
  6. Turn ignition switch on, and then off. Backprobing at ECM, measure voltage between ground and ECM harness connector terminal No. 110 and 112 (Red/Green wires). (Scheme 90) Battery voltage should exist for a few seconds after ignition is turned off. If battery voltage exists for a few seconds, go to next step. If battery voltage does not exist, go to step 9. If battery voltage exists after a few seconds, go to step 16.
  7. Disconnect ECM 116-pin harness connector. ECM is located behind glove box. Disconnect Intelligent Power Distribution Module (IPDM) harness connector E122. IPDM is located at right front corner of engine compartment. Check continuity of Red wire between ECM harness connector terminal No. 31 and IPDM harness connector terminal No. 35. (Scheme 90)and (Scheme 103). Continuity should exist. Also, check circuit for short to ground or short to voltage. If no problem is found, go to step 16. If problem is found, go to next step.
  8. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E130 and E27. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E20 and E32. Check for open or short in circuits between ECM and IPDM. If problem is found, repair as necessary. After repair, retest system.
  9. Turn ignition off. Backprobing at ECM, measure voltage between ground and ECM terminal No. 38 (White/Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, go to step 12.
  10. Disconnect ECM 116-pin harness connector. ECM is located behind glove box. Disconnect Intelligent Power Distribution Module (IPDM) harness connector E122. IPDM is located at right front corner of engine compartment. Check continuity of Red/Green wire between ECM harness connector terminals No. 110 and 112 and IPDM harness connector terminal No. 33. (Scheme 90)and (Scheme 103). Continuity should exist. Also, check circuit for short to ground or short to voltage. If no problem is found, go to step 15. If problem is found, go to next step.
  11. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E130 and E27. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E20 and E32. Check for open or short in circuits between ECM and IPDM. If problem is found, repair as necessary. After repair, retest system.
  12. Disconnect ECM 116-pin harness connector. ECM is located behind glove box. Disconnect Intelligent Power Distribution Module (IPDM) harness connector E122. IPDM is located at right front corner of engine compartment. Check continuity of White/Black wire between ECM harness connector terminal No. 38 and IPDM harness connector terminal No. 44. (Scheme 90)and (Scheme 103). Continuity should exist. Also, check circuit for short to ground or short to voltage. If no problem is found, go to step 14. If problem is found, go to next step.
  13. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E130 and E27. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E20 and E32. Check for open or short in circuits between ECM and IPDM. If problem is found, repair as necessary. After repair, retest system.
  14. Check IPDM fuse No. 51 (15-amp). If fuse is not blown, go to step 16. If fuse is blown, replace fuse. After repair, retest system.
  15. Turn ignition off. Disconnect ECM 116-pin harness connector. ECM is located behind glove box. Check continuity between ground and specified circuits. See «CHECKING ECM GROUND CIRCUITS»(ref-151938-S26262324972004010800000) table. Continuity should exist. Also, check each circuit for short to voltage. If no problem is found, connect ECM harness connector and go to next step. If problem is found, repair as necessary. After repair, retest system.
  16. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. After repair, retest system. If no problem is found, replace IPDM.

Scheme 103

Scheme 103
Scheme 103

Power & Ground Circuits (Frontier 2.4L & Xterra 2.4L)

Note. For engine performance related components locations see scheme 311and see scheme 312.

  1. Start engine. If engine starts, go to step 4. If engine does not start, go to next step.
  2. Turn ignition off, and then on. Backprobing at ECM, measure voltage between ground and ECM harness connector terminal No. 24 (White/Green wire). (Scheme 104)and (Scheme 105). If battery voltage exists, go to step 12. If battery voltage does not exist, go to next step.
  3. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E43 and M65. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M59 and F27. Check for poor, loose, corroded or damaged terminal connections in fuse block junction connector E49. Check fuse block fuses No. 13 (10-amp) and 27 (10-amp). Check for open or short in circuits between ECM and fuse. If problem is found, repair as necessary. After repair, retest system.
  4. Turn ignition off. Backprobing at ECM, measure voltage between ground and ECM terminal No. 80 (Light Blue wire). If battery voltage exists, go to step 6. If battery voltage does not exist, go to next step.
  5. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M81 and F36. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M27. Check fuse block fuses No. 13 (10-amp) and 27 (10-amp). Check for open or short in circuits between ECM and fuses. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition on, and then off. Backprobing at ECM, measure voltage between ECM terminals No. 67, 72 and 117 (Black/Pink wires). Battery voltage should exist at each terminal for a few seconds after ignition is turned off. If battery voltage exists for a few seconds, go to step 12. If battery voltage does not exist, go to next step. If battery voltage exists after a few seconds, go to step 11.
  7. Turn ignition off. Disconnect ECM 124-pin harness connector. ECM is located below instrument cluster. Remove lower instrument panel to access ECM. Disconnect ECM relay harness connector. ECM relay is mounted on bracket under instrument panel next to ECM. Check continuity in circuits between ECM harness connector terminals No. 67, 72 and 117 (all Black/Pink wires) and ECM relay harness connector terminal No. 3. (Scheme 105)and (Scheme 106). Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, repair as necessary. After repair, retest system. If no problem is found, leave harness connectors disconnected and go to next step.
  8. Measure volage between ground and ECM relay harness connector terminals No. 2 and then No. 5 (both wires are Light Blue). If battery voltage exists at both terminals, go to step 10. If battery voltage does not exist at both terminals, go to next step.
  9. Check for open or short in Light Blue wires between ECM relay and in-line harness connector F36. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If problem is found, repair as necessary. After repair, retest system.
  10. Turn ignition off. Disconnect ECM 124-pin harness connector. ECM is located below instrument cluster. Remove lower instrument panel to access ECM. Check continuity in Orange/Black wire between ECM harness connector terminal No. 4 and ECM relay harness connector terminal No. 1. (Scheme 105)and (Scheme 106). Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, repair as necessary. After repair, retest system.
  11. Working with ECM relay, apply battery voltage and ground to terminals No. 1 and 2. (Scheme 106) When battery voltage is applied, continuity should exist between terminals No. 3 and 5. When battery voltage is removed, continuity should not exist. Replace relay, if test values are not as specified.
  12. Turn ignition off. Disconnect ECM 124-pin harness connector. ECM is located below instrument cluster. Remove lower instrument panel to access ECM. Check continuity between ground and ECM harness connector terminals No. 10, 19, 116 and 124 (Black/Red wire), and No. 25 and 32 (Black/Yellow wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuits for short to voltage. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, retest system.
  13. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 104

Scheme 104
Scheme 104

Scheme 105

Scheme 105
Scheme 105

Scheme 106

Scheme 106
Scheme 106

Power & Ground Circuits (Frontier 3.3L & Xterra 3.3L)

  1. Start engine. If engine starts, go to step 6. If engine does not start, go to next step.
  2. Turn ignition off, and then on. Backprobing at ECM, measure voltage between ground and ECM harness connector terminal No. 24 (White/Blue wire) (Scheme 104)and (Scheme 105). If battery voltage exists, go to step 4. If battery voltage does not exist, go to next step.
  3. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E74 and M82. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M59 and F27. Check for poor, loose, corroded or damaged terminal connections in fuse block junction connector E49. Check fuse block fuses No. 13 (10-amp) and 27 (10-amp). Check for open or short in circuits between ECM and fuse. If problem is found, repair as necessary. After repair, retest system.
  4. Turn ignition off. Disconnect ECM 124-pin harness connector. ECM is located below instrument cluster. Remove lower instrument panel to access ECM. (Scheme 104) Check continuity between ground and ECM harness connector terminals No. 10, 19, 116 and 124 (Black/Red wire). (Scheme 105) Check continuity between ground and ECM harness connector terminals No. 25 and 32 (Black/Yellow wire). Continuity should exist at all measurements. Also, check circuits for short to voltage. If problem is found, go to next step. If no problem is found, go to step 15.
  5. Check the following: Check for poor, loose, corroded or damaged terminal connections in joint connector-2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open in ground circuits between ground and ECM. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Backprobing at ECM, measure voltage between ground and ECM terminal No. 80 (Light Blue wire). (Scheme 105) If battery voltage exists, go to step 8. If battery voltage does not exist, go to next step.
  7. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M59 and F27. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M27. Check fuse block fuses No. 13 (10-amp) and 27 (10-amp). Check for open or short in circuits between ECM and fuses. If problem is found, repair as necessary. After repair, retest system.
  8. Turn ignition on, and then off. Backprobing at ECM, measure voltage between ECM terminals No. 67, 72 and 117 (Black/Pink wires). Battery voltage should exist at each terminal for a few seconds after ignition is turned off. If battery voltage exists for a few seconds, go to step 14. If battery voltage does not exist, go to next step. If battery voltage exists after a few seconds, go to step 13.
  9. Disconnect ECM relay harness connector. ECM relay is mounted on bracket under instrument panel next to ECM. (Scheme 104) Measure volage between ground and ECM relay harness connector terminals No. 2 and then No. 5 (Light Blue wires). (Scheme 105) If battery voltage does not exist at both terminals, go to next step. If battery voltage exists at both terminals, go to step 11.
  10. Check for open or short in Light Blue wires between ECM relay and in-line harness connector F27. If problem is found, repair as necessary. After repair, retest system.
  11. Turn ignition off. Disconnect ECM 124-pin harness connector. ECM is located below instrument cluster. Remove lower instrument panel to access ECM. (Scheme 104) Check continuity in Orange/Black wire between ECM harness connector terminal No. 4 and ECM relay harness connector terminal No. 1. (Scheme 105)and (Scheme 106). Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, repair as necessary. After repair, retest system. If no problem is found, leave ECM harness connector disconnected and go to next step.
  12. Check continuity in circuits between ECM harness connector terminals No. 67, 72 and 117 (Black/Pink wires) and ECM relay harness connector terminal No. 3. Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, repair as necessary. After repair, retest system. If no problem is found, leave ECM harness connector disconnected and go to next step.
  13. Working with ECM relay, apply battery voltage and ground to terminals No. 1 and 2. (Scheme 106) When battery voltage is applied, continuity should exist between terminals No. 3 and 5. When battery voltage is removed, continuity should not exist. Replace relay, if test values are not as specified.
  14. Turn ignition off. Disconnect ECM 124-pin harness connector. ECM is located below instrument cluster. Remove lower instrument panel to access ECM. (Scheme 104) Check continuity between ground and ECM harness connector terminals No. 10, 19, 116 and 124 (Black/Red wires). (Scheme 105) Check continuity between ground and ECM harness connector terminals No. 25 and 32 (Black/Yellow wires). Continuity should exist. Also, check circuits for short to voltage. If no problem is found, go to next step. If problem is found, go to step 5.
  15. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Power & Ground Circuits (Maxima)

  1. Start engine. If engine starts, go to step 11. If engine does not start, go to next step.
  2. Turn ignition off and on. Backprobing at ECM, measure voltage between ground and ECM terminal No. 43 (Red wire). (Scheme 89)and (Scheme 90). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 4.
  3. Check the following: Check fuse block fuse No. 17 (10-amp). Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M161 and F68. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors M19 and E89. Check for open or short in circuits between ECM and ignition switch. If problem is found, repair as necessary. After repair, retest system.
  4. Turn ignition off. Disconnect ECM 116-pin harness connector. ECM is located under instrument panel. (Scheme 89) Check continuity between ground and ECM harness connector terminals No. 48, 57, 106 and 108 (Black wires). (Scheme 90) Continuity should exist. Also, check circuits for short to voltage. If problem is found, repair as necessary. After repair, retest system.
  5. Remove ECM relay from relay panel. (Scheme 107) Measure voltage between ground and ECM relay harness connector terminals No. 2 (White/Blue wire) and No. 6 (Purple wire). (Scheme 108) If battery voltage does not exist, go to next step. If battery voltage exists, leave harness connectors disconnected and go to step 7.
  6. Check the following: Check fuse block fuses No. 58 and 59 (15-amp). Check for poor, loose, corroded or damaged terminal connections in joint connector-12. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between ECM and ECM relay. If problem is found, repair as necessary. After repair, retest system.
  7. Check continuity of White/Black wire (changes to White/Red at relay) between ECM harness connector terminal No. 38 and ECM relay harness connector terminal No. 1. (Scheme 90)and (Scheme 108). Also, check circuit for short to ground and short to voltage. If no problem is found, check ignition signal. Perform appropriate procedure under «IGNITION SIGNAL CIRCUITS»(ref-151938-S14853014092004010800000). If problem is found, go to next step.
  8. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E15 and F18. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between ECM and ECM relay. If problem is found, repair as necessary. After repair, retest system.
  9. Turn ignition on, and then off. Backprobing at ECM, measure voltage between ground and ECM terminals No. 31 (Red wires) and then No. 110 and 112 (Red/Green wires). Battery voltage should exist at each terminal for a few seconds after turning ignition off, then drop to about zero volts. If voltage is as specified, go to step 15. If battery voltage does not exist, go to next step. If battery voltage exists for more than a few seconds, go to step 12.
  10. Remove ECM relay from relay panel. (Scheme 107) Measure voltage between ground and ECM relay harness connector terminals No. 3 (White/Blue wire). (Scheme 108) If battery voltage exists, leave ECM relay disconnected and go to step 12. If battery voltage does not exist, go to next step.
  11. Check the following: Check for poor, loose, corroded or damaged terminal connections in joint connector-12. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between ECM relay and fuses. If problem is found, repair as necessary. After repair, retest system.
  12. Check continuity of specified circuits between ECM relay and ECM. See «CHECKING ECM RELAY CIRCUIT VOLTAGE (MAXIMA)»(ref-151938-S05286516512004010800000) table. (Scheme 90)and (Scheme 108). 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 14. CHECKING ECM RELAY CIRCUIT VOLTAGE (MAXIMA) ECM Terminal No. ECM Relay Terminal No. Wire Color 31 7 Red/White 110 & 112 5 Red/Green
  13. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E15 and F18. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between ECM relay and ECM. If problem is found, repair as necessary. After repair, retest system.
  14. Working with ECM relay, apply battery voltage and ground to terminals No. 1 and 2. (Scheme 108) When battery voltage is applied, continuity should exist between terminals No. 3, 5, 6 and 7. When battery voltage is removed, continuity should not exist. If relay tests okay, go to next step. Replace relay, if test values are not as specified.
  15. Turn ignition off. Disconnect ECM 116-pin harness connector. ECM is located under instrument panel. Check continuity between ground and ECM harness connector terminals No. 48, 57, 106 and 108 (Black wires). (Scheme 90) Continuity should exist. Also, check circuits for short to voltage. If problem is found, repair as necessary. After repair, retest system.
  16. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 107

Scheme 107
Scheme 107

Scheme 108

Scheme 108
Scheme 108

Power & Ground Circuits (Murano)

For ECM power and ground circuit wiring diagram and diagnostic procedure (Scheme 109)- (Scheme 115). If no problem is found, check ignition signal. See IGNITION SIGNAL CIRCUITS under IGNITION SYSTEM. For intermittent diagnosis, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For engine control system component locations see scheme 319- see scheme 324. For ECM location, connector and terminal view see scheme 15 For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 109

Scheme 109: Power & Ground Circuits (Murano)
Scheme 109: Power & Ground Circuits (Murano)

Scheme 110

Scheme 110
Scheme 110

Scheme 111

Scheme 111
Scheme 111

Scheme 112

Scheme 112
Scheme 112

Scheme 113

Scheme 113
Scheme 113

Scheme 114

Scheme 114
Scheme 114

Scheme 115

Scheme 115
Scheme 115

Power & Ground Circuits (Pathfinder)

For ECM power and ground circuit wiring diagram and diagnostic procedure (Scheme 116)- (Scheme 122). If no problem is found, check ignition signal. See IGNITION SIGNAL CIRCUITS under IGNITION SYSTEM. For intermittent diagnosis, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For engine control system component locations see scheme 325- see scheme 329. For ECM location, connector and terminal view see scheme 25 For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 116

Scheme 116: Power & Ground Circuits (Pathfinder)
Scheme 116: Power & Ground Circuits (Pathfinder)

Scheme 117

Scheme 117
Scheme 117

Scheme 118

Scheme 118
Scheme 118

Scheme 119

Scheme 119
Scheme 119

Scheme 120

Scheme 120
Scheme 120

Scheme 121

Scheme 121
Scheme 121

Scheme 122

Scheme 122
Scheme 122

Scheme 123

Scheme 123
Scheme 123

Power & Ground Circuits (Sentra 1.8L)

For ECM power and ground circuit wiring diagram and diagnostic procedure (Scheme 124)- (Scheme 129). If no problem is found, check ignition signal. See IGNITION SIGNAL CIRCUITS under IGNITION SYSTEM. For intermittent diagnosis, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For engine control system component locations see scheme 330- see scheme 341. For ECM location, connector and terminal view (Scheme 130) For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 124

Scheme 124: Power & Ground Circuits (Sentra 1.8L)
Scheme 124: Power & Ground Circuits (Sentra 1.8L)

Scheme 125

Scheme 125
Scheme 125

Scheme 126

Scheme 126
Scheme 126

Scheme 127

Scheme 127
Scheme 127

Scheme 128

Scheme 128
Scheme 128

Scheme 129

Scheme 129
Scheme 129

Scheme 130

Scheme 130
Scheme 130

Power & Ground Circuits (Sentra 2.5L)

  1. Start engine. If engine starts, go to step 9. If engine does not start, go to next step.
  2. Turn ignition off and on. Backprobing at ECM, measure voltage between ground and ECM terminal No. 42 (Black/Red wire). (Scheme 87)and (Scheme 90). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 4.
  3. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M19 and E108. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E10 and F48. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors E112 and M1. Check fuse block fuse No. 17 (10-amp). Check for open or short in circuits between ECM and fuse. If problem is found, repair as necessary. After repair, retest system.
  4. Turn ignition off. Disconnect ECM 116-pin harness connector. ECM is located under instrument panel. (Scheme 87) Check continuity between ground and ECM harness connector terminal No. 59 (Black/Red wire). Check continuity between ground and ECM harness connector terminals No. 60, 106 and 108 (Black wires). (Scheme 90) Continuity should exist at each measurement. Also, check circuits for short to voltage. If problem is found, go to next step. If no problem is found, go to step 6.
  5. Check the following: Check for poor, loose, corroded or damaged terminal connections in joint connector-3. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between ground and ECM. If problem is found, repair as necessary. After repair, retest system.
  6. Disconnect ECM relay. (Scheme 131) Measure voltage between ground and ECM relay harness connector terminals No. 1 (White/Blue wire) and No. 6 (Red/Black wire). (Scheme 108) If battery voltage does not exist, go to next step. If battery voltage exists, leave harness connectors disconnected and go to step 8.
  7. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E9 and F47. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check fuse block fuses No. 34 and 36 (15-amp). Check for poor, loose, corroded or damaged terminal connections in underhood fuse and fusible link box harness connectors E22 and E24. Check for open or short in circuits between battery and ECM relay. If problem is found, repair as necessary. After repair, retest system.
  8. Check continuity of White/Green wire between ECM harness connector terminal No. 20 and ECM relay harness connector terminal No. 2. (Scheme 90)and (Scheme 108). Also, check circuit for short to ground and short to voltage. If no problem is found, check ignition signal. Perform appropriate procedure under «IGNITION SIGNAL CIRCUITS»(ref-151938-S14853014092004010800000). If problem is found, repair as necessary. After repair, retest system.
  9. Turn ignition on, and then off. Backprobing at ECM, measure voltage between ground and ECM terminals No. 12 (Red wire), and then No. 109 and 111 (Red/Green wires). Battery voltage should exist at each terminal for a few seconds after turning ignition off, then drop to about zero volts. If voltage is as specified, go to step 13. If battery voltage does not exist, go to next step. If battery voltage exists for more than a few seconds, go to step 12.
  10. Disconnect ECM relay. (Scheme 131) Measure voltage between ground and ECM relay harness connector terminals No. 3 (White/Blue wire). (Scheme 108) If battery voltage does not exist, go to next step. If battery voltage exists, leave ECM relay disconnected and go to step 12.
  11. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E9 and F47. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between ECM relay and fuses. If problem is found, repair as necessary. After repair, retest system.
  12. Check continuity of specified circuits between ECM and ECM relay. See «CHECKING ECM RELAY CIRCUIT VOLTAGE (SENTRA 2.5L)»(ref-151938-S17394272632004010800000) table. (Scheme 90)and (Scheme 108). Also, check circuit for short to ground and short to voltage. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, retest system. CHECKING ECM RELAY CIRCUIT VOLTAGE (SENTRA 2.5L) ECM Terminal No. ECM Relay Terminal No. Wire Color 12 7 Red 109 & 111 5 Red/Green
  13. Working with ECM relay, apply battery voltage and ground to terminals No. 1 and 2. (Scheme 108) When battery voltage is applied, continuity should exist between terminals No. 3, 5, 6 and 7. When battery voltage is removed, continuity should not exist. If relay tests okay, go to next step. Replace relay, if test values are not as specified.
  14. Turn ignition off. Disconnect ECM 116-pin harness connector. ECM is located under instrument panel. (Scheme 87) Check continuity between ground and ECM harness connector terminal No. 59 (Black/Red wire). Check continuity between ground and ECM harness connector terminals No. 60, 106 and 108 (Black wires). (Scheme 90) Continuity should exist at each measurement. Also, check circuits for short to voltage. If problem is found, go to next step. If no problem is found, go to step 16.
  15. Check the following: Check for poor, loose, corroded or damaged terminal connections in joint connector-3. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between ground and ECM. If problem is found, repair as necessary. After repair, retest system.
  16. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 131

Scheme 131
Scheme 131

Power & Ground Circuits (350Z)

For ECM power and ground circuit wiring diagram and diagnostic procedure (Scheme 132)- (Scheme 139). If no problem is found, check ignition signal circuit. See IGNITION SIGNAL CIRCUITS under IGNITION SYSTEM. For intermittent diagnosis, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For engine control system component locations see scheme 346- see scheme 351. For ECM location, connector and terminal view (Scheme 140) For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 132

Scheme 132: Power & Ground Circuits (350Z)
Scheme 132: Power & Ground Circuits (350Z)

Scheme 133

Scheme 133
Scheme 133

Scheme 134

Scheme 134
Scheme 134

Scheme 135

Scheme 135
Scheme 135

Scheme 136

Scheme 136
Scheme 136

Scheme 137

Scheme 137
Scheme 137

Scheme 138

Scheme 138
Scheme 138

Scheme 139

Scheme 139
Scheme 139

Scheme 140

Scheme 140
Scheme 140

EMISSION SYSTEMS & SUB-SYSTEMS

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate figure under COMPONENT LOCATIONS . For vacuum diagram identification, see VACUUM DIAGRAMS article.

EXHAUST GAS RECIRCULATION

ECM controls EGR system based on engine operating conditions. ECM controls ground circuit for EGR Control (EGRC) solenoid opening and closing EGR valve as necessary. (Scheme 141) EGR-VCV or EGRC solenoid remains closed under certain conditions including the following

  1. Engine stopped.
  2. Engine starting.
  3. Engine idling.
  4. Low engine coolant temperature.
  5. Excessively high engine coolant temperature.
  6. High engine speed.
  7. Mass airflow sensor malfunction.

Scheme 141

Scheme 141
Scheme 141

EGR System Check

To test EGR function, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

EGR Backpressure Transducer

To test EGR backpressure transducer, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

EGRC Solenoid

To test EGR control solenoid, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

EGR Temperature Sensor

To test EGR temperature sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

EGR Valve

To test EGR function, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

EGR Volume Control Valve

To test EGR volume control valve, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

EVAPORATIVE EMISSIONS CONTROL SYSTEM

Note. For EVAP system component locations, see appropriate illustration in COMPONENT LOCATIONS .

Note. For vacuum hose and circuit identification, see VACUUM DIAGRAMS article.

Evaporative Emissions (EVAP) control system is used to reduce hydrocarbon (HC) emissions emitted into the atmosphere from the fuel system. Reduction of HC emissions is accomplished by activated charcoals in the EVAP canister. Fuel vapors from the fuel tank are stored in the EVAP canister when engine is not running and during refueling. Vapors are then purged into intake manifold while engine is running. EVAP canister purge volume is controlled by the ECM. EVAP canister purge is shut off during deceleration and idle periods.

EVAP Canister

Remove EVAP canister. Plug vent hose and blow air into port "A". Air should flow freely out of port "B". (Scheme 142) Replace EVAP canister, if operation is not as specified.

Scheme 142

Scheme 142: EVAP Canister
Scheme 142: EVAP Canister

EVAP Canister Purge Volume Control Solenoid Valve

To test EVAP canister purge volume control solenoid valve, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

Fuel Tank Temperature Sensor

To test Fuel Tank Temperature (FTT) sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

Fuel Tank Vacuum Relief Valve (Built Into Fuel Filler Cap)

Note. Applies to all models except Maxima and Pathfinder.

For testing fuel tank vacuum relief valve (Scheme 143)

Scheme 143

Scheme 143: Fuel Tank Vacuum Relief Valve (Built Into Fuel Filler Cap)
Scheme 143: Fuel Tank Vacuum Relief Valve (Built Into Fuel Filler Cap)

ON BOARD REFUELING VAPOR RECOVERY SYSTEM

When refueling vehicle, fuel tank pressure increases. When pressure reaches the setting value of the Refueling Control Valve (RCV) opening pressure, RCV opens. Allowing air and vapor pressure in fuel tank to pass through EVAP vapor cut valve into the EVAP canister. Where fuel vapors are absorbed by EVAP canister activated charcoal and air is purged to atmosphere. When during refueling process fuel tank becomes full, refueling EVAP vapor cut valve is closed and refueling is stopped by auto shut-off. Vapors stored while fueling are purged when vehicle is driven. RCV is closed during driving and EVAP system operates same as in conventional systems.

Strong Fuel Odor From EVAP Canister

WARNINGWhen conducting tests around open fuel tanks and containers observe following: Furnish work area with proper fire safety equipment. DO NOT smoke. Keep open flames and sparks away from work area.
CAUTIONBefore removing fuel lines or hoses, perform following procedures: Disconnect negative battery cable. Release fuel pressure. Place drained fuel into an explosion proof container and secure lid. Always replace any "O" ring seals when removed. Be careful to not twist or kink hoses or tube when they are installed. To avoid damage to hoses, DO NOT overtighten hose clamps. After repairs are completed, run vehicle and check for fuel leaks. DO NOT continue to top off fuel tank after fuel pump nozzle automatically shuts off.
  1. Remove EVAP canister along with EVAP canister vent control valve. Weigh EVAP canister with vent valve attached. If EVAP canister weighs less than 4 lbs. (1.8 kg), go to next step. If canister weighs more than specified, go to step 3 .
  2. If water drains from EVAP canister, go to next step. If no water drains from canister, go to step 6 .
  3. Replace EVAP canister. After repairs, go to next step.
  4. Check water separator. See «WATER SEPARATOR»(ref-151938-S31744752542004010800000) . If water separator test okay, go to next step. If water separator does not test okay, replace water separator.
  5. Check vacuum hose between EVAP canister and water separator for clogging or poor connections. If problem is found, replace vacuum hose. After repair, retest system.
  6. Check refueling EVAP vapor cut valve. See «REFUELING EVAP VAPOR CUT VALVE»(ref-151938-S21362324722004010800000) . If no problem is found, go to next step. If problem is found, replace refueling EVAP vapor cut valve.
  7. Check refueling control valve. See «REFUELING CONTROL VALVE»(ref-151938-S28104284502004010800000) . If no problem is found, testing is complete. If problem is found, replace refueling control valve.

Cannot Refuel/Strong Fuel Odor From Fuel Filler While Refueling

  1. Remove EVAP canister along with EVAP canister vent control valve. Weigh EVAP canister with vent valve attached. If EVAP canister weighs less than 4 lbs. (1.8 kg), go to next step. If canister weighs more than specified, go to step 3 .
  2. If water drains from EVAP canister, go to next step. If no water drains from canister, go to step 6 .
  3. Replace EVAP canister. After repairs, go to next step.
  4. Check water separator. See «WATER SEPARATOR»(ref-151938-S31744752542004010800000) . If water separator tests okay, go to next step. If water separator does not test okay, replace water separator.
  5. Check vacuum hose between EVAP canister and water separator for clogging or poor connections. If problem is found, replace vacuum hose. After repair, retest system.
  6. Check vent hoses and tubes between EVAP canister and refueling control valve for clogging, kinks, looseness or improper connections. If no problem is found, go to next step. If problem is found, repair or replace hoses or tubes as necessary.
  7. Check signal and recirculation lines for clogging, dents or cracks. If no problem is found, go to next step. If problem is found, repair as necessary.
  8. Check refuel control valve. See «REFUELING CONTROL VALVE»(ref-151938-S28104284502004010800000) . If no problem is found, go to next step. If problem is found, repair as necessary.
  9. Check refueling EVAP vapor cut valve. See «REFUELING EVAP VAPOR CUT VALVE»(ref-151938-S21362324722004010800000) . If no problem is found, go to next step. If problem is found, replace refueling EVAP vapor cut valve.
  10. Check fuel filler tube and hose between fuel tank and gas cap for clogging, dents or cracks. If no problem is found, go to next step. If problem is found, replace refueling EVAP vapor cut valve.
  11. Drain fuel from tank. Remove fuel filler tube and hose. Using a small wooden dowel, attempt to open one-way check valve. Check valve should open and close when pushed with dowel. Check one-way fuel check valve for sticking or clogging. If no problem is found, testing is complete. If problem is found, replace fuel tank along with check valve.

Refueling EVAP Vapor Cut Valve

With CONSULT-II

  1. Remove fuel tank.
  2. Drain fuel from fuel tank as follows: Remove fuel feed hose from fuel level sensor unit (on top of fuel tank). Connect a spare hose to fuel level sensor unit. On CONSULT-II, select ACTIVE TEST mode, and then FUEL PUMP RELAY. Activate fuel pump and capture fuel. When fuel tank is completely drained, go to next step.
  3. Check refueling EVAP vapor cut valve for being stuck by blowing air into refueling EVAP vapor cut valve from "B". (Scheme 144)or (Scheme 145). If air flows freely into fuel tank, go to next step. If air does not flow freely into fuel tank, replace fuel tank.
  4. Check EVAP vapor cut valve for being stuck open as follows: Connect vacuum pump to hose ends "A" and "B" using suitable 3-way connector. (Scheme 144)or (Scheme 145). On fuel tank, remove fuel level sensor unit retaining ring. When reassembling, always replace "O" ring seal with NEW part. Place fuel tank upside down. Apply vacuum pressure to hose ends "A" and "B". With fuel level sensor unit opening free, ensure that vacuum holds at 3.94 Hg (13.3 kPa). If vacuum does not hold, replace fuel tank. If vacuum holds, refueling EVAP vapor cut valve is okay.

Without CONSULT-II

  1. Remove fuel tank.
  2. Drain fuel from tank as follows: Remove fuel level sensor unit retainer. Drain fuel from tank using a hand pump. When fuel tank is completely drained, go to next step.
  3. Check refueling EVAP vapor cut valve for being stuck by blowing air into refueling EVAP vapor cut valve from "B". (Scheme 144)or (Scheme 145). If air flows freely into fuel tank, go to next step. If air does not flow freely into fuel tank, replace fuel tank.
  4. Check EVAP vapor cut valve for being stuck open as follows: Connect vacuum pump to hose ends "A" and "B" using suitable 3-way connector. (Scheme 144)or (Scheme 145). On fuel tank, remove fuel level sensor unit retaining ring. When reassembling always replace "O" ring seal with NEW part. Place fuel tank upside down. Apply vacuum pressure to both hose ends "A" and "B". With fuel level sensor unit opening free, ensure that vacuum holds at 3.94 Hg (13.3 kPa). If vacuum does not hold, replace fuel tank. If vacuum holds, refueling EVAP vapor cut valve is okay.

Scheme 144

Scheme 144
Scheme 144

Scheme 145

Scheme 145
Scheme 145

Refueling Control Valve

Note. On Frontier, Maxima, Sentra and Xterra, refueling control valve is not replaceable. If defective, fuel tank must be replaced.

Remove fuel filler cap. Check air continuity between hose ends "A" and "B". Blow air into hose end "B". (Scheme 144)or (Scheme 145). Air should flow freely into fuel tank. Blow air into hose "A". Air should not flow. Using a hand pressure pump with a vacuum "T", apply 2.9 psi (20 kPa) of pressure to hoses "A" and "B". Air should not escape. If operation is not as specified, replace fuel tank with refueling control valve. If operation is as specified, refueling control valve is okay.

Water Separator

Note. DO NOT attempt to disassemble water separator.

  1. Visually inspect water separator air inlet for insect nests.
  2. Visually inspect water separator for cracks or flaws in appearance.
  3. Visually inspect water separator for cracks or flaws in hoses.
  4. Check that "A" and "C" are not clogged by blowing air into "B" with "A" and "C" plugged. (Scheme 146) If problem is found, replace water separator.

Scheme 146

Scheme 146
Scheme 146

POSITIVE CRANKCASE VENTILATION

With engine idling, remove vent hose from PCV valve. A hissing noise should be heard. Strong vacuum should be felt immediately when a finger is placed over valve inlet. Clean or replace PCV valve or hoses, if it does not operate as specified.

SWIRL CONTROL SYSTEM (PATHFINDER)

Note. It is possible the MIL will be illuminated due to malfunctions in the swirl control system. If DTC(s) P1130, P1131 or P1165 is set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS-PATHFINDER article.

SWIRL CONTROL SYSTEM (SENTRA 1.8L SULEV ONLY)

Note. It is possible the MIL will be illuminated due to malfunctions in the swirl control system. If DTC(s) P1132, P1137 or P1138 is set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS-SENTRA 1.8L ULEV & SULEV article.

ENGINE SENSORS & SWITCHES

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate figure under COMPONENT LOCATIONS . For vacuum diagram identification, see VACUUM DIAGRAMS article.

Since many computer-controlled and monitored components set a diagnostic trouble code if they malfunction, testing procedures are covered in appropriate SELF-DIAGNOSTICS article.

ACCELERATOR PEDAL POSITION SENSOR

To test accelerator pedal position sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

A/C HIGH PRESSURE SWITCH

To test A/C high pressure switch, see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

AIR/FUEL RATIO SENSOR (SENTRA 1.8L SULEV ONLY)

To test A/F sensor, see appropriate DTC in SELF-DIAGNOSTICS-SENTRA 1.8L article.

AUTOMATIC SPEED CONTROL INDICATOR

To test automatic speed control indicator, see appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

BRAKE SWITCH

To test ACSD brake switch, see appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

CAMSHAFT POSITION SENSOR

To test camshaft position sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

CRANKSHAFT POSITION SENSOR

To test crankshaft position sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

See EMISSION SYSTEMS & SUB-SYSTEMS .

ENGINE COOLANT TEMPERATURE SENSOR

To test engine coolant temperature sensor, see related DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

FRONT HEATED OXYGEN SENSOR

To test front HO2S, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

FUEL LEVEL SENSOR

To test fuel level sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

To test fuel tank temperature sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

IGNITION SWITCH (START SIGNAL)

Note. Information for Murano, Pathfinder, Sentra (1.8L) and 350Z is not available from manufacturer.

Altima & Sentra (2.5L)

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Using CONSULT-II in DATA MONITOR mode, observe START SIGNAL under following conditions. See «CHECKING START SIGNAL (ALTIMA & SENTRA 2.5L)»(ref-151938-S11275394622004010800000) table. If start signal displays as specified, go to step 8. If start signal does not display as specified, go to step 6. CHECKING START SIGNAL (ALTIMA & SENTRA 2.5L) Condition Start Signal Ignition Switch ON OFF Ignition Switch OFF ON
  3. Backprobing at ECM, measure voltage between ground and ECM terminal No. 41 (Brown/White wire in Altima; Black/Yellow wire in Sentra) while cranking engine. (Scheme 90) Battery voltage should exist when ignition switch is in START position. Voltage should be zero volts when ignition switch is in any other position except START. If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
  4. Turn ignition switch to OFF position, then to START position. If starter motor operates, go to next step. If starter motor does not operate, repair starting system. See appropriate STARTERS article in ELECTRICAL.
  5. Turn ignition switch off. Check fuse block fuse No. 9 (10-amp). If fuse is okay, go to next step. If fuse is blown, replace and retest system.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87)or (Scheme 88). Check continuity between ECM harness connector terminal No. 41 (Brown/White wire in Altima; Black/Yellow wire in Sentra) and fuse block through to battery. (Scheme 90) See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Also, check circuit for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 8.
  7. For Altima, check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M71 and F59. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors E30 and M3. Check for open or short in Green wire between ignition switch and fuse block. Check for open or short in Brown/White wire between ECM and fuse block. If problem is found, repair as necessary. After repair, retest system. For Sentra, check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M58 and F26. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors E103 and M2. Check for open or short in White/Red wire between ignition switch and fuse block. Check for open or short in Black/Yellow wire between ECM and fuse block. If problem is found, repair as necessary. After repair, retest system.
  8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Altima (3.5L)

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Using CONSULT-II in DATA MONITOR mode, observe START SIGNAL under following conditions. See «CHECKING START SIGNAL (ALTIMA 3.5L)»(ref-151938-S26361227482004010800000) table. If start signal displays as specified, go to step 8. If start signal does not display as specified, go to step 4. CHECKING START SIGNAL (ALTIMA 3.5L) Condition Start Signal Ignition Switch ON OFF Ignition Switch START ON
  3. Backprobing at ECM, measure voltage between ground and ECM terminal No. 42 (Brown/White wire) while cranking engine. (Scheme 90) Battery voltage should exist when ignition switch is in START position. Voltage should be zero volts when ignition switch is in any other position except START. If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
  4. Turn ignition switch to OFF position, then to START position. If starter motor operates, go to next step. If starter motor does not operate, repair starting system. See appropriate STARTERS article in ELECTRICAL.
  5. Turn ignition switch off. Disconnect fuse block fuse No. 9 (10-amp). If fuse is okay, go to next step. If fuse is blown, replace and retest system.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87)or (Scheme 88). Disconnect ignition switch harness connector. Check continuity in Brown/White wire between ECM harness connector terminal No. 42 and ignition switch harness connector terminal "R". (Scheme 90) See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Also, check circuit for short to ground or 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 for poor, loose, corroded or damaged terminal connections at in-line harness connectors M71 and F59. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors E30 and M3. Check for open or short in Black/Yellow wire between ignition switch and fuse block. Check for open or short in Brown/White wire between ECM and fuse block. If problem is found, repair as necessary. After repair, retest system.
  8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Frontier & Xterra

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Using CONSULT-II in DATA MONITOR mode, observe START SIGNAL under following conditions. See «CHECKING START SIGNAL (FRONTIER & XTERRA)»(ref-151938-S01297368662004010800000) table. If start signal displays as specified, go to step 7. If start signal does not display as specified, go to step 4. CHECKING START SIGNAL (FRONTIER & XTERRA) Condition Start Signal Ignition Switch ON OFF Ignition Switch START ON
  3. Backprobing at ECM, measure voltage between ground and ECM terminal No. 20 (Blue/Orange wire). (Scheme 104)and (Scheme 105). Turn ignition switch to START position. Battery voltage should exist. With ignition switch in any other position, about zero volts should exist. If voltage is as specified, go to step 7. If voltage is not as specified, go to next step.
  4. Check fuse block fuse No. 7 (7.5-amp). Fuse block is located under left side of instrument panel. Replace fuse, if necessary. If fuse is okay, go to next step.
  5. Turn ignition off. Disconnect ECM 124-pin harness connector. For ECM location (Scheme 104) Remove fuse block fuse No. 7. Check continuity between ECM harness connector terminal No. 20 (Blue/Orange wire) and fuse No. 7 socket cavity. 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 7.
  6. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M81 and F36. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors M26. Check for open or short in wire between ECM and fuse block. If problem is found, repair as necessary. After repair, retest system.
  7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Maxima

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Using CONSULT-II in DATA MONITOR mode, observe START SIGNAL under following conditions. See «CHECKING START SIGNAL (MAXIMA)»(ref-151938-S31185735732004010800000) table. If start signal displays as specified, go to step 8. If start signal does not display as specified, go to step 4. CHECKING START SIGNAL (MAXIMA) Condition Start Signal Ignition Switch ON OFF Ignition Switch START ON
  3. Backprobing at ECM, measure voltage between ground and ECM terminal No. 42 (Brown/White wire) while cranking engine. (Scheme 90) Battery voltage should exist when ignition switch is in START position. Voltage should be zero volts when ignition switch is in any other position except START. If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
  4. Turn ignition switch to OFF position, then to START position. If starter motor operates, go to next step. If starter motor does not operate, repair starting system. See appropriate STARTERS article in ELECTRICAL.
  5. Check fuse block fuse No. 21 (10-amp). Fuse block is located under left side of instrument panel. If fuse is blown, replace as necessary fuse. If fuse is okay, go to next step.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 89) Disconnect ignition switch 6-pin harness connector. Check continuity of Brown/White wire between ECM harness connector terminal No. 42 and ignition switch terminal No. 6, including fuse block fuse No. 21. (Scheme 90)and (Scheme 147). Continuity should exist. Also, check circuits 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 for poor, loose, corroded or damaged terminal connections at in-line harness connectors F68 and M161. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connectors M17 and E83. Check for open or short in Brown/White wire between ignition switch and ECM. Check for open or short in Black/White wire between ignition switch and fuse block. If problem is found, repair as necessary. After repair, retest system.
  8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 147

Scheme 147
Scheme 147

INTAKE AIR TEMPERATURE SENSOR

To test intake air temperature sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

KNOCK SENSOR

To test knock sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

MASS AIRFLOW SENSOR

To test mass airflow sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

POWER STEERING PRESSURE SWITCH

Note. For Sentra 1.8L, refer to DTC P0550: PSP SENSOR under DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

Turn ignition off. Disconnect power steering pressure switch harness connector. For locations (Scheme 148)- (Scheme 155). Start engine. Check continuity between switch terminals. If switch has only one terminal, check continuity between ground and switch terminal. Continuity should exist when steering wheel is being turned. Continuity should not exist when steering wheel is not being turned. Replace switch, if continuity is not as specified.

Scheme 148

Scheme 148: POWER STEERING PRESSURE SWITCH
Scheme 148: POWER STEERING PRESSURE SWITCH

Scheme 149

Scheme 149
Scheme 149

Scheme 150

Scheme 150
Scheme 150

Scheme 151

Scheme 151
Scheme 151

Scheme 152

Scheme 152
Scheme 152

Scheme 153

Scheme 153
Scheme 153

Scheme 154

Scheme 154
Scheme 154

Scheme 155

Scheme 155
Scheme 155

Altima

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Using CONSULT-II in DATA MONITOR mode, observe PW/ST SIGNAL in specified conditions. See «CHECKING POWER STEERING SWITCH FUNCTION (ALTIMA)»(ref-151938-S02748879192004010800000) table. If PW/ST SIGNAL is as specified, go to step 7. If signal is not as specified, go to step 4. CHECKING POWER STEERING SWITCH FUNCTION (ALTIMA) Condition PW/ST Signal Steering In Neutral Position OFF Steering Wheel Turned ON
  3. Start engine. Backprobing at ECM, measure voltage between ground and ECM terminal No. 46 (Green wire). (Scheme 88)and (Scheme 90). When steering wheel is being turned quickly, voltage should be about zero volts. When steering wheel is in straight ahead position, voltage should be about 5 volts. If voltage is not as specified, go to next step. If voltage is as specified, go to step 7.
  4. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 88) Disconnect power steering pressure switch harness connector. (Scheme 148) Check continuity of Green wire between power steering pressure switch harness connector and ECM harness connector terminal No. 46. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 7.
  5. Check for open or short in circuit between power steering pressure switch and ECM. If problem is found, repair as necessary. After repair, retest system.
  6. Check power steering pressure switch. See «POWER STEERING PRESSURE SWITCH»(ref-151938-S13062651692004010800000). If problem is found, replace switch. If switch is okay, go to next step.
  7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.
  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Using CONSULT-II in DATA MONITOR mode, observe PW/ST SIGNAL in specified conditions. See «CHECKING POWER STEERING SWITCH FUNCTION (FRONTIER & XTERRA)»(ref-151938-S02410248122004010800000) table. If PW/ST SIGNAL is as specified, go to step 6. If signal is not as specified, go to step 4. CHECKING POWER STEERING SWITCH FUNCTION (FRONTIER & XTERRA) Condition PW/ST Signal Steering In Neutral Position OFF Steering Wheel Turned ON
  3. Start engine. Backprobing at ECM, measure voltage between ground and ECM terminal No. 39 (Gray/Red wire). (Scheme 104)and (Scheme 105). When steering wheel is being turned quickly, voltage should be about zero volts. When steering wheel is not being turned quickly, voltage should be about 5 volts. If voltage is as specified, go to step 6. If voltage is not as specified, go to next step.
  4. Disconnect ECM 124-pin harness connector. For ECM location (Scheme 104) Check continuity of Gray/Red wire between power steering pressure switch harness connector terminal No. 1 and ECM harness connector terminal No. 39. (Scheme 105) Continuity should exist. Also, check for open or short in Gray/Red wire between power steering pressure switch and ECM. If problem is found, repair as necessary. After repair, retest system. If no problem is found, go to next step.
  5. Check power steering pressure switch. See «POWER STEERING PRESSURE SWITCH»(ref-151938-S13062651692004010800000). If problem is found, repair as necessary. After repair, retest system.
  6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

For test and diagnosis of power steering pressure switch (Scheme 156)- (Scheme 158). For locating power steering pressure switch and circuit wiring diagram (Scheme 151)- (Scheme 159). If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and replacement procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 156

Scheme 156: Maxima
Scheme 156: Maxima

Scheme 157

Scheme 157
Scheme 157

Scheme 158

Scheme 158
Scheme 158

Scheme 159

Scheme 159
Scheme 159

Murano

For test and diagnosis of power steering pressure switch (Scheme 160)- (Scheme 162). For locating power steering pressure switch and circuit wiring diagram (Scheme 152)- (Scheme 163). If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and replacement procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 160

Scheme 160: Murano
Scheme 160: Murano

Scheme 161

Scheme 161
Scheme 161

Scheme 162

Scheme 162
Scheme 162

Scheme 163

Scheme 163
Scheme 163

Pathfinder

For test and diagnosis of power steering pressure switch (Scheme 164)- (Scheme 166). For locating power steering pressure switch and circuit wiring diagram (Scheme 153)- (Scheme 167). If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and replacement procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 164

Scheme 164: Pathfinder
Scheme 164: Pathfinder

Scheme 165

Scheme 165
Scheme 165

Scheme 166

Scheme 166
Scheme 166

Scheme 167

Scheme 167
Scheme 167

Sentra (2.5L)

  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Start engine. Using CONSULT-II DATA MONITOR mode, observe PW/ST SIGNAL parameter. With steering wheel in neutral position PW/ST SIGNAL parameter should display OFF. When steering wheel is turned parameter should display ON. If parameter displays as specified, go to step 7. If parameter does not display as specified, go to step 4.
  3. Start engine. Backprobing at ECM, measure voltage between ground and ECM terminal No. 46 (Green wire). (Scheme 87)and (Scheme 90). When steering wheel is quickly turned, voltage should be about zero volts. When steering wheel is in neutral position, voltage should be about 5 volts. If voltage is as specified, go to step 7. If voltage is not as specified, go to next step.
  4. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87) Check continuity of Green wire between ECM harness connector terminal No. 46 and power steering switch harness connector terminal No. 1. (Scheme 90) Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 7.
  5. Check for open or short in Green wire between ECM and power steering switch. If problem is found, repair as necessary. After repair, repeat step 2 or 3 as needed. If no problem is found, go to next step.
  6. Check power steering pressure switch. See «POWER STEERING PRESSURE SWITCH»(ref-151938-S13062651692004010800000). Replace, if necessary. If power steering pressure switch is okay, go to next step.
  7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

350Z

For test and diagnosis of power steering pressure switch (Scheme 168)- (Scheme 169). For locating power steering pressure switch and circuit wiring diagram (Scheme 155)- (Scheme 170). If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and replacement procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 168

Scheme 168: 350Z
Scheme 168: 350Z

Scheme 169

Scheme 169
Scheme 169

Scheme 170

Scheme 170
Scheme 170

REAR HEATED OXYGEN SENSOR

To test rear HO2S, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

REFRIGERANT PRESSURE SENSOR

To test refrigerant pressure sensor on Frontier and Xterra, see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

Altima 2.5L

For refrigerant pressure sensor system and component testing (Scheme 171)- (Scheme 175). For engine control system component locations see scheme 302- see scheme 305. For ECM location, connector and terminal view (Scheme 90) If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 171

Scheme 171: Altima 2.5L
Scheme 171: Altima 2.5L

Scheme 172

Scheme 172
Scheme 172

Scheme 173

Scheme 173
Scheme 173

Scheme 174

Scheme 174
Scheme 174

Scheme 175

Scheme 175
Scheme 175

Altima 3.5L

For refrigerant pressure sensor system and component testing (Scheme 176)- (Scheme 180). For engine control system component locations see scheme 306- see scheme 310. For ECM location, connector and terminal view (Scheme 90) If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 176

Scheme 176: Altima 3.5L
Scheme 176: Altima 3.5L

Scheme 177

Scheme 177
Scheme 177

Scheme 178

Scheme 178
Scheme 178

Scheme 179

Scheme 179
Scheme 179

Scheme 180

Scheme 180
Scheme 180

For refrigerant pressure sensor system and component testing (Scheme 181)- (Scheme 184). For engine control system component locations see scheme 315- see scheme 318. For ECM location, connector and terminal view (Scheme 90) If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 181

Scheme 181: Maxima
Scheme 181: Maxima

Scheme 182

Scheme 182
Scheme 182

Scheme 183

Scheme 183
Scheme 183

Scheme 184

Scheme 184
Scheme 184

For refrigerant pressure sensor system and component testing (Scheme 185)- (Scheme 189). For engine control system component locations see scheme 319- see scheme 324. For ECM location, connector and terminal view see scheme 15 If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 185

Scheme 185: Murano
Scheme 185: Murano

Scheme 186

Scheme 186
Scheme 186

Scheme 187

Scheme 187
Scheme 187

Scheme 188

Scheme 188
Scheme 188

Scheme 189

Scheme 189
Scheme 189

For refrigerant pressure sensor system and component testing (Scheme 190)- (Scheme 193). For engine control system component locations see scheme 325- see scheme 329. For ECM location, connector and terminal view see scheme 25 If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 190

Scheme 190: Pathfinder
Scheme 190: Pathfinder

Scheme 191

Scheme 191
Scheme 191

Scheme 192

Scheme 192
Scheme 192

Scheme 193

Scheme 193
Scheme 193

Sentra 1.8L

For refrigerant pressure sensor system and component testing (Scheme 194)- (Scheme 198). For engine control system component locations see scheme 330- see scheme 341. For ECM location, connector and terminal view (Scheme 130) If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 194

Scheme 194: Sentra 1.8L
Scheme 194: Sentra 1.8L

Scheme 195

Scheme 195
Scheme 195

Scheme 196

Scheme 196
Scheme 196

Scheme 197

Scheme 197
Scheme 197

Scheme 198

Scheme 198
Scheme 198

Sentra 2.5L

For refrigerant pressure sensor system and component testing (Scheme 199)- (Scheme 203). For engine control system component locations see scheme 342- see scheme 345. For ECM location, connector and terminal view (Scheme 90) If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 199

Scheme 199: Sentra 2.5L
Scheme 199: Sentra 2.5L

Scheme 200

Scheme 200
Scheme 200

Scheme 201

Scheme 201
Scheme 201

Scheme 202

Scheme 202
Scheme 202

Scheme 203

Scheme 203
Scheme 203

For refrigerant pressure sensor system and component testing (Scheme 204)- (Scheme 208). For engine control system component locations see scheme 346- see scheme 351. For ECM location, connector and terminal view (Scheme 140) If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 204

Scheme 204: 350Z
Scheme 204: 350Z

Scheme 205

Scheme 205
Scheme 205

Scheme 206

Scheme 206
Scheme 206

Scheme 207

Scheme 207
Scheme 207

Scheme 208

Scheme 208
Scheme 208

THROTTLE POSITION SENSOR

To test throttle position sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

VEHICLE SPEED SENSOR

To test vehicle speed sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

FUEL SYSTEM

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate figure under COMPONENT LOCATIONS . For vacuum diagram identification, see VACUUM DIAGRAMS article.

Relieving Fuel Pressure

Remove fuel pump fuse. Start engine and allow engine to run until it stalls. Crank engine an additional 2-3 times to ensure all pressure has dissipated.

Fuel Pressure

For basic fuel pressure procedures and specifications, see FUEL PRESSURE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article.

Fuel Pressure Regulator

  1. Relieve fuel pressure from system. See «RELIEVING FUEL PRESSURE»(ref-151938-S34378006642004010800000) . Connect fuel pressure gauge in line between fuel filter and fuel rail. Remove vacuum hose from fuel pressure regulator, and plug hose. Connect hand-held vacuum pump to pressure regulator. Start engine and let idle.
  2. Gradually apply vacuum to regulator. Fuel pressure should decrease as vacuum increases. Compare values to «CHECKING FUEL PRESSURE»(ref-151932-S14410273682003010900000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If results are not as specified, replace fuel pressure regulator.

Fuel Pump

Disconnect fuel pump harness connector. For location, see FUEL PUMP HARNESS CONNECTOR LOCATIONS table. On Frontier 2.4L, measure resistance between fuel pump connector terminals No. 5 and 6. (Scheme 209) On Maxima and Sentra, measure resistance between fuel pump connector terminals No. 1 and 3. (Scheme 210) On all other models, measure resistance between fuel pump 2-pin connector terminals (Scheme 211) On all models except Murano and 350Z, resistance should be 0.2-5.0 ohms at 77°F (25°C). On Murano and 350Z, resistance should be approximately 1.0 ohms at 77°F (25°C). Replace fuel pump, if resistance is not as specified.

ApplicationLocation
Altima, Maxima, Murano, Pathfinder & SentraUnder Rear Seat
Frontier & XterraTop Of Fuel Tank
350ZUnder Glove Box Tray & Inspection Hole Cover

FUEL PUMP HARNESS CONNECTOR LOCATIONS

Scheme 209

Scheme 209
Scheme 209

Scheme 210

Scheme 210
Scheme 210

Scheme 211

Scheme 211
Scheme 211

Fuel Pump Relay

See RELAYS under RELAYS & SOLENOIDS.

Fuel System Condenser

Turn ignition off. Disconnect 2-pin harness connector. Check resistance between condenser (+) and (-) pins. Resistance should be 1 megohm or more at 77°F (25°C).

Fuel Pump Control System (Altima 2.5L)

For fuel pump control system diagnosis and testing procedure (Scheme 213)- (Scheme 216). For fuel pump control circuit wiring diagram (Scheme 212) To check condenser, see FUEL SYSTEM CONDENSER. To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 212

Scheme 212: Fuel Pump Control System (Altima 2.5L)
Scheme 212: Fuel Pump Control System (Altima 2.5L)

Scheme 213

Scheme 213
Scheme 213

Scheme 214

Scheme 214
Scheme 214

Scheme 215

Scheme 215
Scheme 215

Scheme 216

Scheme 216
Scheme 216

Fuel Pump Control System (Altima 3.5L)

For fuel pump control system diagnosis and testing procedure (Scheme 218)- (Scheme 221). For fuel pump control circuit wiring diagram (Scheme 217) To check condenser, see FUEL SYSTEM CONDENSER. To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 217

Scheme 217: Fuel Pump Control System (Altima 3.5L)
Scheme 217: Fuel Pump Control System (Altima 3.5L)

Scheme 218

Scheme 218
Scheme 218

Scheme 219

Scheme 219
Scheme 219

Scheme 220

Scheme 220
Scheme 220

Scheme 221

Scheme 221
Scheme 221

Fuel Pump Control System (Frontier & Xterra 2.4L)

For fuel pump control system diagnosis and testing procedure (Scheme 223)- (Scheme 225). For fuel pump control circuit wiring diagram (Scheme 222) To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 222

Scheme 222: Fuel Pump Control System (Frontier & Xterra 2.4L)
Scheme 222: Fuel Pump Control System (Frontier & Xterra 2.4L)

Scheme 223

Scheme 223
Scheme 223

Scheme 224

Scheme 224
Scheme 224

Scheme 225

Scheme 225
Scheme 225

Fuel Pump Control System (Frontier & Xterra 3.3L)

For fuel pump control system diagnosis and testing procedure (Scheme 227)- (Scheme 229). For fuel pump control circuit wiring diagram (Scheme 226) To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 226

Scheme 226: Fuel Pump Control System (Frontier & Xterra 3.3L)
Scheme 226: Fuel Pump Control System (Frontier & Xterra 3.3L)

Scheme 227

Scheme 227
Scheme 227

Scheme 228

Scheme 228
Scheme 228

Scheme 229

Scheme 229
Scheme 229

Fuel Pump Control System (Maxima)

For fuel pump control system diagnosis and testing procedure (Scheme 231)- (Scheme 234). For fuel pump control circuit wiring diagram (Scheme 230) To check condenser, see FUEL SYSTEM CONDENSER. To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 230

Scheme 230: Fuel Pump Control System (Maxima)
Scheme 230: Fuel Pump Control System (Maxima)

Scheme 231

Scheme 231
Scheme 231

Scheme 232

Scheme 232
Scheme 232

Scheme 233

Scheme 233
Scheme 233

Scheme 234

Scheme 234
Scheme 234

Fuel Pump Control System (Murano)

For fuel pump control system diagnosis and testing procedure (Scheme 236)- (Scheme 239). For fuel pump control circuit wiring diagram (Scheme 235) To check condenser, see FUEL SYSTEM CONDENSER. To check fuel pump, see FUEL PUMP. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 235

Scheme 235: Fuel Pump Control System (Murano)
Scheme 235: Fuel Pump Control System (Murano)

Scheme 236

Scheme 236
Scheme 236

Scheme 237

Scheme 237
Scheme 237

Scheme 238

Scheme 238
Scheme 238

Scheme 239

Scheme 239
Scheme 239

Fuel Pump Control System (Pathfinder)

For fuel pump control system diagnosis and testing procedure (Scheme 241)- (Scheme 244). For fuel pump control circuit wiring diagram (Scheme 240) To check condenser, see FUEL SYSTEM CONDENSER. To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 240

Scheme 240: Fuel Pump Control System (Pathfinder)
Scheme 240: Fuel Pump Control System (Pathfinder)

Scheme 241

Scheme 241
Scheme 241

Scheme 242

Scheme 242
Scheme 242

Scheme 243

Scheme 243
Scheme 243

Scheme 244

Scheme 244
Scheme 244

Fuel Pump Control System (Sentra 1.8L)

For fuel pump control system diagnosis and testing procedure (Scheme 245)- (Scheme 250). To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 245

Scheme 245: Fuel Pump Control System (Sentra 1.8L)
Scheme 245: Fuel Pump Control System (Sentra 1.8L)

Scheme 246

Scheme 246
Scheme 246

Scheme 247

Scheme 247
Scheme 247

Scheme 248

Scheme 248
Scheme 248

Scheme 249

Scheme 249
Scheme 249

Scheme 250

Scheme 250
Scheme 250

Fuel Pump Control System (Sentra 2.5L)

  1. Turn ignition on. Pinch supply fuel hose with fingers. Pulsation should be felt on fuel hose for 5 seconds after ignition is turned on. If pulsation is felt, system is okay. If pulsation is not felt, go to next step.
  2. Turn ignition off. Disconnect fuel pump relay harness connector. Fuel pump relay is located behind left kick panel. (Scheme 251) Turn ignition on. Measure voltage between ground and fuel pump relay harness connector terminals No. 1 (Black/Red wire). If battery voltage does not exist, go to next step. If battery voltage exists, leave harness connector disconnected and go to step 4.
  3. Check the following: Check fuse block fuse No. 17 (10-amp). Check for open or short in Black/Red wire between fuel pump relay and fuse block. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If problem is found, repair as necessary. After repair, retest system.
  4. Measure voltage between ground and fuel pump relay terminal No. 5 (Black/White wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 9.
  5. Check the following: Check fuse block fuse No. 29 (15-amp). Check for open or short in Black/White wire between fuel pump relay and fuse block. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect fuel pump harness connector located behind access cover, under rear seat. Check continuity between ground and fuel pump harness connector terminal No. 3 (Black wire). (Scheme 252) Check continuity in Black/Yellow wire between fuel pump harness connector terminal No. 1 and fuel pump relay harness connector terminal No. 3. Continuity should exist at both measurements. Also, check circuits for short to ground or 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 for open or short in Black wire between ground and fuel pump. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in Black/Yellow wire between fuel pump and fuel pump relay. If problem is found, repair as necessary. After repair, retest system.
  8. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87) Check continuity of Black/Pink wire between fuel pump relay harness connector terminal No. 2 and ECM harness connector terminal No. 10 (without NVIS) or No. 29 (with NVIS). (Scheme 90) Also, check circuit for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 10.
  9. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors B3 and M16. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M58 and F26. Check for open or short in circuits between ECM and fuel pump relay. If problem is found, repair as necessary. After repair, retest system.
  10. Working with fuel pump relay, apply battery voltage and ground to terminals No. 1 and 2. When battery voltage is applied, continuity should exist between terminals No. 3 and 5. When battery voltage is removed, continuity should not exist. Replace relay, if test values are not as specified. If relay tests okay, go to next step.
  11. Check fuel pump. See «FUEL PUMP»(ref-151938-S41196315772004010800000). If problem is found, replace as necessary. If fuel pump is okay, go to next step.
  12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 251

Scheme 251
Scheme 251

Scheme 252

Scheme 252
Scheme 252

Fuel Pump Control System (350Z)

For fuel pump control system diagnosis and testing procedure (Scheme 254)- (Scheme 257). For fuel pump control circuit wiring diagram (Scheme 253) To check condenser, see FUEL SYSTEM CONDENSER. To check fuel pump, see FUEL PUMP. For relay location, see ECM & FUEL PUMP RELAY LOCATIONS table. If no problem is indicated at this time, problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For component removal and installation procedures, see appropriate REMOVAL & INSTALLATION article.

Scheme 253

Scheme 253: Fuel Pump Control System (350Z)
Scheme 253: Fuel Pump Control System (350Z)

Scheme 254

Scheme 254
Scheme 254

Scheme 255

Scheme 255
Scheme 255

Scheme 256

Scheme 256
Scheme 256

Scheme 257

Scheme 257
Scheme 257

Fuel Injector

Turn ignition off. Disconnect fuel injector harness connector. Measure resistance between injector terminals. See FUEL INJECTOR RESISTANCE table for specification. Replace injector, if resistance is not as specified.

ApplicationSpecification
Altima & Sentra (2.5L)12.1-12.9 Ohms @ 77°F (25°C)
Frontier & Xterra
2.4L7.3-9.9 Ohms @ 77°F (25°C)
3.3L10-14 Ohms @ 77°F (25°C)
Altima (3.5L), Maxima, Murano, Pathfinder, Sentra (1.8L) & 350Z13.5-17.5 Ohms @ 68°F (20°C)

FUEL INJECTOR RESISTANCE

Fuel Injector Circuits (Altima 2.5L & Sentra 2.5L)

  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Start engine. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. Each cylinder should drop off when tested. If engine performs as specified, go to step 8. If engined does not perform as specified, go to step 4.
  3. Start engine and listen to each fuel injector. If every injector clicks, system is okay. If any injector does not click, go to next step
  4. Turn ignition off. Disconnect suspect fuel injector 2-pin harness connector. Turn ignition on. Measure voltage between ground and injector harness connector terminal No. 1 (Pink wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 6.
  5. For Sentra, check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E108 and M19. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E10 and F48. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F12 and F101. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M1. Check fuse block fuse No. 17 (10-amp). Check for open or short between suspect fuel injector and fuse. For Altima, check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F59 and M71. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F12 and F101. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M4. Check fuse block fuse No. 1 (10-amp). Check for open or short between suspect fuel injector and fuse. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. (Scheme 87)or (Scheme 88). Check continuity of specified wire between fuel injector harness connector terminal No. 2 and ECM. See «FUEL INJECTOR CIRCUIT IDENTIFICATION (ALTIMA 2.5L & SENTRA 2.5L)»(ref-151938-S28669522132004010800000) table. (Scheme 90) 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. FUEL INJECTOR CIRCUIT IDENTIFICATION (ALTIMA 2.5L & SENTRA 2.5L) Injector No. Wire Color At Injector Terminal No. 2 ECM Terminal No. Wire Color At ECM 1 White 101 Red/Black 2 Red/White 102 Red/White 3 Green/Black 103 Red/Yellow 4 Blue 104 Red/Blue
  7. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F12 and F101. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between suspect fuel injector and ECM.
  8. Check fuel injector. See «FUEL INJECTOR»(ref-151938-S07585569442004010800000). If problem is found, replace as necessary. If no problem is indicated at this time, go to next step.
  9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Fuel Injector Circuits (Altima 3.5L)

  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Start engine. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. Each cylinder should drop off when tested. If engine performs as specified, go to step 9. If engine does not perform as specified, go to step 4.
  3. Start engine and listen to each fuel injector. If every injector clicks, go to step 9. If any injector does not click, go to next step
  4. Turn ignition off. Disconnect suspect fuel injector 2-pin harness connector. Turn ignition on. Measure voltage between ground and injector harness connector terminal No. 1 (Red wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 6.
  5. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F59 and M71. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F44 and F101. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M4. Check fuse block fuse No. 1 (10-amp). Check for open or short between suspect fuel injector and fuse. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. (Scheme 88) Check continuity of specified wire between fuel injector harness connector terminal No. 2 and ECM. See «FUEL INJECTOR CIRCUIT IDENTIFICATION (ALTIMA 3.5L)»(ref-151938-S02719884172004010800000) table. (Scheme 90) 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. FUEL INJECTOR CIRCUIT IDENTIFICATION (ALTIMA 3.5L) Injector No. ECM Terminal No. Wire Color 1 1 Red/Black 2 2 Red/White 3 3 Red/Yellow 4 11 Red/Blue 5 12 Blue/White 6 13 Purple/Red
  7. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F44 and F101. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between suspect fuel injector and ECM.
  8. Check fuel injector. See «FUEL INJECTOR»(ref-151938-S07585569442004010800000). If problem is found, replace as necessary. If no problem is indicated at this time, go to next step.
  9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Fuel Injector Circuits (Frontier & Xterra)

  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Start engine. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. Each cylinder should drop off when tested. If engine performs as specified, go to step 9. If engine does not perform as specified, go to step 4.
  3. Start engine. Listen to each fuel injector. If every injector clicks, go to step 9. If any injector does not click, go to next step.
  4. Turn ignition off. Disconnect suspect injector 2-pin harness connector. Turn ignition on. Measure voltage between ground and injector harness connector terminal No. 1 (Black/Red wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 6.
  5. On 2.4L, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F27 and M59. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M26. Check fuse block fuse No. 3 (10-amp). Check for open or short between suspect fuel injector and fuse. For 3.3L, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F27 and M59. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F37 and F101. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M26. Check fuse block fuse No. 3 (10-amp). Check for open or short between suspect fuel injector and fuse. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect ECM 124-pin harness connector. For ECM location (Scheme 104) Check continuity of specified wire between ECM harness connector and appropriate injector harness connector terminal No. 2. See «FUEL INJECTOR CIRCUIT IDENTIFICATION (FRONTIER & XTERRA)»(ref-151938-S08436023982004010800000) table. (Scheme 105) 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. FUEL INJECTOR CIRCUIT IDENTIFICATION (FRONTIER & XTERRA) Injector No. ECM Terminal No. Wire Color 1 102 White/Black 2 109 White/Blue 3 104 White/Red 4 111 White/Purple 5 (1) 106 White/Green 6 (1) 113 White (1) V6 only.
  7. On 2.4L, check for open or short in circuit between suspect injector and ECM. On 3.3L, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F37 and F101. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F38 and F102. Check for open or short between suspect fuel injector and fuse. If problem is found, repair as necessary. After repair, retest system.
  8. Check fuel injector. See «FUEL INJECTOR»(ref-151938-S07585569442004010800000). If problem is found, replace as necessary. If no problem is found, go to next step.
  9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Fuel Injector Circuits (Maxima)

  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Start engine. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. Each cylinder should drop off when tested. If engine performs as specified, go to step 10. If engine does not perform as specified, go to step 4.
  3. Start engine and listen to each fuel injector. If every injector clicks, go to step 10. If any injector does not click, go to next step
  4. Turn ignition off. On bank 1, disconnect fuel injector 2-pin harness connectors. On bank 2, disconnect fuel injector 8-pin sub-harness connector F58. Sub-harness connector F58 is located on left side of intake manifold. (Scheme 258) Turn ignition on. Measure voltage between ground and injector harness connector terminal No. 1 (Red wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Measure voltage between ground and fuel injector sub-harness connector terminal No. 5 (Red wire). (Scheme 259) If battery voltage does not exist, go to next step. If battery voltage exists, go to step 6.
  5. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F68 and M161. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F58 and F197. Check for poor, loose, corroded or damaged terminal connections in fuse block harness connector M19. Check fuse block fuse No. 17 (10-amp). Check for open or short between suspect fuel injector and fuse. Check for open or short between sub-harness connector terminal No. 5 and fuse. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 89) Check continuity between fuel injector harness connector terminal No. 2 and specified ECM or injector sub-harness connector terminal. See «FUEL INJECTOR CIRCUIT IDENTIFICATION (MAXIMA)»(ref-151938-S13589334672004010800000) table. (Scheme 90)and (Scheme 259). 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, leave harness connectors disconnected and go to step 8. FUEL INJECTOR CIRCUIT IDENTIFICATION (MAXIMA) Injector No. ECM Terminal No. Injector Sub-Harness Terminal No. Wire Color 1..... 6 Red/Black 2 2..... Red/White 3..... 2 Red/Yellow 4 11..... Red/Blue 5..... 1 Blue/White 6 13..... Purple/Red
  7. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F58 and F197. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between in-line harness connector F58 and ECM. Check for open or short between suspect fuel injector and ECM. If problem is found, repair as necessary. After repair, retest system.
  8. Disconnect bank 1 fuel injector 2-pin harness connectors. Check continuity between specified fuel injector harness connector terminal and injector sub-harness connector F197 terminal. See «CHECKING FUEL INJECTOR SUB-HARNESS CONNECTOR (MAXIMA)»(ref-151938-S30969108152004010800000) table. (Scheme 259) Continuity should exist. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, retest system. CHECKING FUEL INJECTOR SUB-HARNESS CONNECTOR (MAXIMA) Fuel Injector No. Sub-Harness Connector Terminal No. Wire Color 1 6 Red/Black 3 2 Red/Yellow 5 1 Blue/White Power Supply 5 Red
  9. Check fuel injector. See «FUEL INJECTOR»(ref-151938-S07585569442004010800000). If problem is found, replace as necessary. If no problem is indicated at this time, go to next step.
  10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 258

Scheme 258
Scheme 258

Scheme 259

Scheme 259
Scheme 259

Fuel Injector Circuits (Murano)

For injector circuit test procedure (Scheme 260)- (Scheme 265). If no problem is indicated at this time, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 260

Scheme 260: Fuel Injector Circuits (Murano)
Scheme 260: Fuel Injector Circuits (Murano)

Scheme 261

Scheme 261
Scheme 261

Scheme 262

Scheme 262
Scheme 262

Scheme 263

Scheme 263
Scheme 263

Scheme 264

Scheme 264
Scheme 264

Scheme 265

Scheme 265
Scheme 265

Fuel Injector Circuits (Pathfinder)

For injector circuit test procedure (Scheme 266)- (Scheme 270). If no problem is indicated at this time, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 266

Scheme 266: Fuel Injector Circuits (Pathfinder)
Scheme 266: Fuel Injector Circuits (Pathfinder)

Scheme 267

Scheme 267
Scheme 267

Scheme 268

Scheme 268
Scheme 268

Scheme 269

Scheme 269
Scheme 269

Scheme 270

Scheme 270
Scheme 270

Fuel Injector Circuits (Sentra 1.8L)

  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Start engine. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. Each cylinder should drop off when tested. If engine performs as specified, go to step 9. If engine does not perform as specified, go to step 4.
  3. Start engine and listen to each fuel injector. If every injector clicks, system is okay. If any injector does not click, go to next step
  4. Turn ignition off. Disconnect suspect fuel injector harness connector. Turn ignition on. Measure voltage between ground and injector harness connector terminal No. 2 (Black/Red wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 6.
  5. Check the following: Check fuse block fuse No. 17 (10-amp). Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M19 and E108. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E9 and F47. Check for open or short in Black/Red wire between suspect injector and fuse. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition switch off. Disconnect ECM 121-pin harness connector. For ECM location (Scheme 87) Check continuity in specified circuits between injector harness connector terminal No. 1 and ECM. See «FUEL INJECTOR CIRCUIT IDENTIFICATION (SENTRA)»(ref-151938-S34705712022004010800000) table. (Scheme 90) Continuity should exist. Also, check harness 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. FUEL INJECTOR CIRCUIT IDENTIFICATION (SENTRA) Injector No. ECM Terminal No. Wire Color 1 23 Red/Black 2 42 Yellow/Black 3 22 Green/Black 4 41 Blue/Black
  7. Check for open or short in circuits between suspect injector and ECM. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If problem is found, repair as necessary. If no problem is found, go to next step.
  8. Check fuel injector. See «FUEL INJECTOR»(ref-151938-S07585569442004010800000). If problem is found, replace as necessary. See FUEL RAILS & INJECTORS under FUEL SYSTEM in REMOVAL & INSTALLATION article. If injector is okay, go to next step.
  9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Fuel Injector Circuits (350Z)

For injector circuit test procedure (Scheme 271)- (Scheme 276). If no problem is indicated at this time, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 271

Scheme 271: Fuel Injector Circuits (350Z)
Scheme 271: Fuel Injector Circuits (350Z)

Scheme 272

Scheme 272
Scheme 272

Scheme 273

Scheme 273
Scheme 273

Scheme 274

Scheme 274
Scheme 274

Scheme 275

Scheme 275
Scheme 275

Scheme 276

Scheme 276
Scheme 276

IDLE CONTROL SYSTEM

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate figure under COMPONENT LOCATIONS . For vacuum diagram identification, see VACUUM DIAGRAMS article.

IDLE AIR CONTROL VALVE-AUXILIARY AIR CONTROL VALVE

To test idle air control valve-auxiliary air control valve, see related DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

  1. Start engine and warm to normal operating temperature. Check idle speed. Idle speed should be 750-850 RPM (on 2.4L) or 700-800 RPM (on 3.3L) with transmission in Park or Neutral. If idle speed is as specified, go to next step. If idle speed is not as specified, adjust idle speed. See «IDLE SPEED, IGNITION TIMING & IDLE MIXTURE RATIO ADJUSTMENT»(ref-151928-S19799417862003010900000) in ON-VEHICLE ADJUSTMENTS article.
  2. Turn A/C and blower on, then recheck idle speed. Idle speed should now be 875 RPM or more (on 2.4L), or 850 RPM or more (on 3.3L). If idle speed is as specified, go to next step. If idle speed is not as specified, verify that A/C compressor functions normally. If A/C compressor functions normally, turn A/C off and go to next step. If A/C compressor does not function normally, repair A/C system as necessary. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  3. Turn ignition off. Disconnect Idle Air Control Valve-Fast Idle Control Device (IACV-FICD) solenoid valve 2-pin harness connector. (Scheme 277)or (Scheme 278). Start engine. Turn A/C and blower on. Measure voltage between ground and IACV-FICD solenoid valve harness connector terminal No. 2 (Green/Black wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 5.
  4. On 2.4L, check the following: Check for open or short in Green/Black wire between IACV-FICD solenoid valve and in-line harness connector F27. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. On 3.3L, check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F38 and F102. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in Green/Black wire between IACV-FICD solenoid valve and in-line harness connector F27. If problem is found, repair as necessary. After repair, retest system.
  5. Turn ignition off. Check continuity between ground and IACV-FICD solenoid valve harness connector terminal No. 1 (Black/Red wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If no problem is found, go to step 8.
  6. Check continuity in Black/Yellow wire between IACV-FICD solenoid valve harness connector terminal No. 1 and Ambient Temperature (AT) sensor harness connector terminal No. 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. If problem is found, go to next step. If no problem is found, go to step 8.
  7. On 2.4L, check the following: Check for open or short in circuits between ground and IACV-FICD solenoid valve. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. On 3.3L, check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F38 and F102. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F36 and M81. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M65 and E43. Check for open or short in diode F35. Check for open or short in circuits between ground and ambient temperature switch. Check for open or short in circuits between IACV-FICD solenoid valve and ambient temperature switch. If problem is found, repair as necessary. After repair, retest system.
  8. Check IACV-FICD solenoid valve. See «IDLE AIR CONTROL VALVE-FAST IDLE CONTROL DEVICE SOLENOID VALVE»(ref-151938-S34362473002004010800000). If problem is found, replace IACV-FICD solenoid valve. If IACV-FICD solenoid valve is okay, go to next step.
  9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 277

Scheme 277
Scheme 277

Scheme 278

Scheme 278
Scheme 278

IDLE AIR CONTROL VALVE-FAST IDLE CONTROL DEVICE SOLENOID VALVE

Remove IACV-FICD solenoid valve. See COMPONENT LOCATIONS . Using jumper wires, apply battery voltage to IACV-FICD solenoid terminals. On all models, IACV-FICD solenoid should click. Inspect IACV-FICD solenoid plunger for sticking. Also check for broken spring. Replace IACV-FICD solenoid, if operation is not as specified.

IGNITION SYSTEM

If engine cranks but does not run or immediately stalls, perform appropriate IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article. Engine cranks but will not run diagnostic procedure will determine if problem is in the ignition or fuel systems. If any DTCs are stored, see related DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate figure under COMPONENT LOCATIONS . For vacuum diagram identification, see VACUUM DIAGRAMS article.

IGNITION COIL (FRONTIER & XTERRA)

Ignition coil is located in distributor. Turn ignition off. Disconnect distributor 2-pin harness connector (ignition coil connector). Remove distributor cap. For primary coil, measure resistance between distributor 2-pin connector terminals (component side). For secondary coil, measure resistance between distributor 2-pin connector terminal No. 7 and coil tower. (Scheme 279) See IGNITION COIL RESISTANCE (FRONTIER & XTERRA) table. Replace distributor assembly, if resistance is not as specified.

ApplicationPrimarySecondary
Frontier & Xterra
2.4LLess Than 1 Ohm @ 77°F (25°C)7-13 K/Ohms @ 77°F (25°C)
3.3L.5-1.0 Ohm @ 77°F (25°C)About 12 K/Ohms @ 77°F (25°C)

IGNITION COIL RESISTANCE (FRONTIER & XTERRA)

Scheme 279

Scheme 279
Scheme 279

POWER TRANSISTOR (FRONTIER & XTERRA)

Power transistor is located in distributor. Turn ignition off. Disconnect distributor 2-pin and 6-pin harness connectors. Measure resistance between distributor 2-pin connector terminal No. 8 and distributor 6-pin connector terminal No. 2 (component side). (Scheme 280) If resistance is zero ohms, replace distributor assembly. If resistance is not zero ohms, power transistor is okay.

Scheme 280

Scheme 280: POWER TRANSISTOR (FRONTIER & XTERRA)
Scheme 280: POWER TRANSISTOR (FRONTIER & XTERRA)
  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. If engine speed does not drop as each cylinder is tested, testing is complete. If engine speed does drop as each cylinder is tested, go to step 8.
  3. Start engine and allow to idle. Let engine idle. Backprobing at ECM, connect an oscilloscope between ground and ECM terminals No. 21, 22, 23 and 24 and read waveform signal voltage. (Scheme 90) Compare waveform to waveform shown. (Scheme 281) If waveform is the same, testing is complete. If waveform is not the same, go to step 8.
  4. Turn ignition on. Backprobing at ECM, measure voltage between ground and ECM harness connector terminals No. 109 and 111 (Red/Green wires). If battery voltage exists, leave ignition on and go to next step. If battery voltage does not exist, check power supply for ECM. See «POWER & GROUND CIRCUITS (ALTIMA 2.5L)»(ref-151938-S15735266192004010800000) or «POWER & GROUND CIRCUITS (SENTRA 2.5L)»(ref-151938-S04700082962004010800000) under COMPUTERIZED ENGINE CONTROLS.
  5. Backprobing at ECM, measure voltage between ground and ECM harness connector terminals No. 12 (Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check power supply for ECM. See «POWER & GROUND CIRCUITS (ALTIMA 2.5L)»(ref-151938-S15735266192004010800000) or «POWER & GROUND CIRCUITS (SENTRA 2.5L)»(ref-151938-S04700082962004010800000) under COMPUTERIZED ENGINE CONTROLS.
  6. Turn ignition off. Disconnect ignition condenser 2-pin harness connector. Check continuity of Red wire between ECM harness connector terminal No. 12 and condenser (+) terminal. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Also, check continuity of Black wire between ground and condenser (-) terminal. Continuity should exist at each measurement. Check circuit for short to ground and short to voltage. If no problem is found, go to next step. If problem is found, repair circuit as necessary. After repair, retest system.
  7. Check ignition condenser. See «IGNITION CONDENSER»(ref-151938-S04392750352004010800000). If no problem is found, go to next step. If problem is found, replace condenser.
  8. Turn ignition off. Reconnect any disconnected harness connectors. Disconnect suspect ignition coil 3-pin harness connector. Turn ignition on. Measure voltage between ground and ignition coil harness connector terminal No. 3 (Red wire). (Scheme 282) If battery voltage exists, leave harness connector disconnected and go to step 10. If battery voltage does not exist, go to next step.
  9. For Altima, check the following: Check for open or short between suspect ignition coil and Intelligent Power Distribution Module (IPDM). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between suspect ignition coil and ECM. For Sentra, check the following: Check for open or short between suspect ignition coil and ECM relay. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between suspect ignition coil and ECM. If problem is found, repair as necessary. After repair, retest system.
  10. Turn ignition off. Check continuity in Black wire between ground and suspect ignition coil harness connector terminal No. 2. (Scheme 282) Continuity should exist. Also, check harness for short to voltage. If no problem is found, leave ignition off and go to next step. If problem is found, repair as necessary. After repair, retest system.
  11. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87)or (Scheme 88). Check continuity between ignition coil terminal No. 1 and ECM harness connector terminals No. 21, 22, 23 and 24. (Scheme 90)and (Scheme 282). Continuity should exist at each measurement. Also, check circuits for short to ground or short to voltage. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, retest system.
  12. Check ignition coil with power transistor. See «IGNITION COIL WITH POWER TRANSISTOR»(ref-151938-S05833278902004010800000). If no problem is found, go to next step. If problem is found, replace suspect ignition coil.
  13. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 281

Scheme 281
Scheme 281

Scheme 282

Scheme 282
Scheme 282
  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. If engine speed drops as each cylinder is tested, testing is complete. If engine speed does not drop as each cylinder is tested, go to step 10.
  3. Start engine and allow to idle. Backprobing at ECM, connect an oscilloscope between ground and ECM terminals No. 5, 6, 7, 15, 16 and 17 and read waveform signal voltage. (Scheme 90) Compare waveform to waveform shown. (Scheme 281) If waveform is the same, testing is complete. If waveform is not the same, go to step 10.
  4. Turn ignition off, wait 10 seconds and turn ignition on. Backprobing at ECM, measure voltage between ground and ECM harness connector terminals No. 110 and 112 (Red/Green wire). If battery voltage exists, leave ignition on and go to next step. If battery voltage does not exist, check power supply for ECM. See «POWER & GROUND CIRCUITS (ALTIMA 3.5L)»(ref-151938-S16477535622004010800000) under COMPUTERIZED ENGINE CONTROLS.
  5. Backprobing at ECM, measure voltage between ground and ECM harness connector terminals No. 31 (Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check power supply for ECM. See «POWER & GROUND CIRCUITS (ALTIMA 3.5L)»(ref-151938-S16477535622004010800000) under COMPUTERIZED ENGINE CONTROLS.
  6. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 88) Disconnect Intelligent Power Distribution Module (IPDM) 12-pin harness connector E122. IPDM is located at right front corner of engine compartment. Check continuity of Red wire between ECM harness connector terminal No. 31 and IPDM harness connector terminal No. 35. (Scheme 90)and (Scheme 103). Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, leave harness connector disconnected and go to next step. If no problem is found, replace IPDM. After repair, retest system.
  7. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E27 and E130. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E20 and E32. Check for open or short in circuits between ECM and IPDM. If problem is found, repair as necessary. After repair, retest system. If no problem is found, leave ECM harness connector disconnected and go to next step.
  8. Turn ignition off. Disconnect condenser 2-pin harness connector. Condenser is located on wiring harness along side of intake manifold collector, near vacuum reservoir. Check continuity of Red wire between ECM harness connector terminal No. 12 and condenser (+) terminal. Check continuity of Black wire between ground and condenser - terminal. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist at each measurement. Also, check circuit for short to ground and short to voltage. If no problem is found, go to next step. If problem is found, repair circuit as necessary. After repair, retest system.
  9. Check ignition condenser. See «IGNITION CONDENSER»(ref-151938-S04392750352004010800000). If no problem is found, go to next step. If problem is found, replace condenser.
  10. Turn ignition off. Reconnect any disconnected harness connectors. Disconnect suspect ignition coil 3-pin harness connector. Turn ignition on. Measure voltage between ground and ignition coil harness connector terminal No. 3 (Red wire). (Scheme 282) If battery voltage exists, leave harness connector disconnected and go to step 12. If battery voltage does not exist, go to next step.
  11. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F43 and F201. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between suspect ignition coil and ECM. Check for open or short between suspect ignition coil and harness connector F32. If problem is found, repair as necessary. After repair, retest system.
  12. Turn ignition off. Check continuity in Black wire between ground and suspect ignition coil harness connector terminal No. 2. (Scheme 282) Continuity should exist. Also, check harness for short to voltage. If no problem is found, leave ignition off and go to next step. If problem is found, repair as necessary. After repair, retest system.
  13. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F43 and F201. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between suspect ignition coil and ECM. If problem is found, repair as necessary. After repair, retest system.
  14. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87)or (Scheme 88). Check continuity between ignition coil harness connector terminal No. 1 and ECM harness connector terminals No. 5, 6, 7, 15, 16 and 17. (Scheme 90)and (Scheme 282). Continuity should exist at each measurement. Also, check circuits for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 16.
  15. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F43 and F201. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short between suspect ignition coil and ECM. If problem is found, repair as necessary. After repair, retest system.
  16. Check ignition coil with power transistor. See «IGNITION COIL WITH POWER TRANSISTOR»(ref-151938-S05833278902004010800000). If no problem is found, go to next step. If problem is found, replace suspect ignition coil. After repair retest system.
  17. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.
  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. If engine speed does not drop as each cylinder is tested, go to step 12. If engine speed drops as each cylinder is tested, go to step 7.
  3. Let engine idle. Backprobing at ECM, connect an oscilloscope between ground and ECM terminal No. 1 (Purple/White wire) and read waveform signal voltage. (Scheme 104)and (Scheme 105). Compare waveform to waveform shown. (Scheme 283) If waveform is the same, go to step 12. If waveform is not the same, go to step 7.
  4. Turn ignition off. Disconnect distributor 2-pin harness connector F17 (ignition coil connector). Turn ignition on. Measure voltage between ground and ignition coil harness connector terminal No. 7 (Black/White wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 6.
  5. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E43 and M65. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F27 and M59. Check for open or short in Black/White wire between ignition coil and ignition switch. If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect distributor power transistor 6-pin harness connector F13. Check continuity between ground and distributor power transistor harness connector F13 terminal No. 2 (Black/Red wire). (Scheme 284) Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair circuit as necessary. After repair, retest system. If no problem is found, leave harness connector disconnected and go to next step.
  7. Turn ignition off. Disconnect ECM 124-pin harness connector. For ECM location (Scheme 104) Check continuity of Purple/White wire between ECM harness connector terminal No. 1 and distributor power transistor harness connector terminal No. 1. (Scheme 105)and (Scheme 284). Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair circuit as necessary. After repair, retest system. If no problem is found, go to next step.
  8. Check ignition coil. See «IGNITION COIL»(ref-151938-S12064949072004010800000). If ignition coil tests okay, go to next step. If ignition coil does not test okay, replace distributor assembly.
  9. Check power transistor. See «POWER TRANSISTOR»(ref-151938-S10975682402004010800000). If power transistor tests okay, go to next step. If power transistor does not test okay, replace distributor assembly.
  10. Turn ignition off. Disconnect distributor 2-pin harness connector (ignition coil connector). Remove tape covering resistor. (Scheme 285) Disconnect resistor 2-pin harness connector. Check continuity of Black/Red wire between resistor harness connector terminal No. 1 and distributor 2-pin harness connector terminal No. 8. Backprobing at ECM, check continuity of Black wire between resistor harness connector terminal No. 2 and ECM harness connector terminal No. 2. (Scheme 105) See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist at both measurements. Also, check circuits for short to ground and short to voltage. If problem is found, repair circuit(s) as necessary. After repair, retest system. If no problem is found, leave resistor harness connector disconnected and go to next step.
  11. Measure resistance between resistor connector terminals (component side). Resistance should be about 2200 ohms at 77°F (25°C). (Scheme 286) If resistance is as specified, go to next step. If resistance is not as specified, replace resistor.
  12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 283

Scheme 283
Scheme 283

Scheme 284

Scheme 284
Scheme 284

Scheme 285

Scheme 285
Scheme 285

Scheme 286

Scheme 286
Scheme 286
  1. Start engine. If engine starts and CONSULT-II is available, go to next step. If engine starts and CONSULT-II is not available, go to step 3. If engine does not start, go to step 4.
  2. Using CONSULT-II in ACTIVE TEST mode, perform POWER BALANCE test. If engine speed drops as each cylinder is tested, testing is complete. If engine speed does not drop as each cylinder is tested, go to step 14.
  3. Start engine and allow to idle. Backprobing at ECM, connect an oscilloscope between ground and ECM terminals No. 5, 6, 7, 15, 16 and 17 and read waveform signal voltage. (Scheme 90) Compare waveform to waveform (Scheme 281) If waveform is the same, testing is complete. If waveform is not the same, go to step 14.
  4. Turn ignition off, wait 10 seconds and turn ignition on. Backprobing at ECM, measure voltage between ground and ECM terminals No. 110 and 112 (Red/Green wire). If battery voltage exists, leave ignition on and go to next step. If battery voltage does not exist, check power supply for ECM. See «POWER & GROUND CIRCUITS (MAXIMA)»(ref-151938-S00603960272004010800000) under COMPUTERIZED ENGINE CONTROLS.
  5. Backprobing at ECM, measure voltage between ground and ECM terminal No. 31 (Red wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step 11.
  6. Turn ignition off. Disconnect ECM relay from underhood fuse and relay panel. For ECM relay location (Scheme 107) Check continuity of Red wire (changes to Red/White at relay) between ECM terminal No. 31 and ECM relay terminal No. 7. (Scheme 90) Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, leave ECM relay disconnected and go to step 8.
  7. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E15 and F18. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuit between ECM relay and ECM. If problem is found, repair as necessary. After repair, retest system.
  8. Measure voltage between ground and ECM relay harness connector terminal No. 6. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 10.
  9. Check the following: Check fuse No. 58 (15-amp). Fuse is located in underhood fuse and relay box. Check for open or short in circuit between ECM relay and ECM. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If problem is found, repair as necessary. After repair, retest system.
  10. Working with ECM relay, apply battery voltage and ground to terminals No. 1 and 2. (Scheme 108) When battery voltage is applied, continuity should exist between terminals No. 3, 5, 6 and 7. When battery voltage is removed, continuity should not exist. If relay tests okay, go to step 19. Replace relay if test values are not as specified.
  11. Turn ignition off. Disconnect ignition condenser 2-pin harness connector. Ignition condenser is located at wiring harness along front of intake manifold. Backprobing at ECM, check continuity in Red wire between ECM terminal No. 31 and condenser terminal No. 1. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check for short to ground or short to voltage. If no problem is found, leave condenser harness disconnected and go to next step. If problem is found, repair as necessary. After repair, retest system.
  12. Check continuity of Black wire between ground and ignition condenser harness connector terminal No. 2. If no problem is found, leave condenser harness disconnected and go to next step. If problem is found, repair as necessary. After repair, retest system.
  13. Check condenser. See «IGNITION CONDENSER»(ref-151938-S04392750352004010800000). If no problem is found, go to next step. If problem is found, replace condenser.
  14. Turn ignition off. Connect any disconnected harness connectors. Disconnect suspect ignition coil 3-pin harness connector. Turn ignition on. Measure voltage between ground and ignition coil harness connector terminal No. 3 (Red wire). (Scheme 282) If battery voltage does not exist, go to next step. If battery voltage exists, go to step 16.
  15. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors F59 and F221. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for open or short in circuits between suspect ignition coil and in-line harness connector F18. If problem is found, repair as necessary. After repair, retest system.
  16. Turn ignition off. Check continuity of Black wire between ground and suspect ignition coil harness connector terminal No. 2. (Scheme 282) Continuity should exist. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, retest system.
  17. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 89) Check continuity between ignition coil terminal No. 1 and ECM harness connector terminals No. 21, 22, 23, 30, 31 and 32. (Scheme 90)and (Scheme 282). Continuity should exist at each measurement. Also, check circuits for short to ground or short to voltage. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, retest system.
  18. Check ignition coil with power transistor. See «IGNITION COIL WITH POWER TRANSISTOR»(ref-151938-S05833278902004010800000). If no problem is found, go to next step. If problem is found, replace suspect ignition coil. After repair retest system.
  19. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

For ignition signal circuit system and component testing (Scheme 287)- (Scheme 298). For diagnosis of ECM power supply circuit, see POWER & GROUND CIRCUITS (MURANO). For intermittent problem, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Scheme 287

Scheme 287: Murano
Scheme 287: Murano

Scheme 288

Scheme 288
Scheme 288

Scheme 289

Scheme 289
Scheme 289

Scheme 290

Scheme 290
Scheme 290

Scheme 291

Scheme 291
Scheme 291

Scheme 292

Scheme 292
Scheme 292

Scheme 293

Scheme 293
Scheme 293

Scheme 294

Scheme 294
Scheme 294

Scheme 295

Scheme 295
Scheme 295

Scheme 296

Scheme 296
Scheme 296

Scheme 297

Scheme 297
Scheme 297

Scheme 298

Scheme 298
Scheme 298

For ignition signal circuit system and component testing (Scheme 299)- (Scheme 308). For diagnosis of ECM power supply circuit, see POWER & GROUND CIRCUITS (PATHFINDER). For intermittent problem, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Scheme 299

Scheme 299: Pathfinder
Scheme 299: Pathfinder

Scheme 300

Scheme 300
Scheme 300

Scheme 301

Scheme 301
Scheme 301

Scheme 302

Scheme 302
Scheme 302

Scheme 303

Scheme 303
Scheme 303

Scheme 304

Scheme 304
Scheme 304

Scheme 305

Scheme 305
Scheme 305

Scheme 306

Scheme 306
Scheme 306

Scheme 307

Scheme 307
Scheme 307

Scheme 308

Scheme 308
Scheme 308

For ignition signal circuit system and component testing (Scheme 309)- (Scheme 319). For diagnosis of ECM power supply circuit, see POWER & GROUND CIRCUITS (SENTRA 1.8L). For intermittent problem, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Scheme 309

Scheme 309: Sentra 1.8L
Scheme 309: Sentra 1.8L

Scheme 310

Scheme 310
Scheme 310

Scheme 311

Scheme 311
Scheme 311

Scheme 312

Scheme 312
Scheme 312

Scheme 313

Scheme 313
Scheme 313

Scheme 314

Scheme 314
Scheme 314

Scheme 315

Scheme 315
Scheme 315

Scheme 316

Scheme 316
Scheme 316

Scheme 317

Scheme 317
Scheme 317

Scheme 318

Scheme 318
Scheme 318

Scheme 319

Scheme 319
Scheme 319

For ignition signal circuit system and component testing (Scheme 320)- (Scheme 330). For diagnosis of ECM power supply circuit, see POWER & GROUND CIRCUITS (350Z). For intermittent problem, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Scheme 320

Scheme 320: 350Z
Scheme 320: 350Z

Scheme 321

Scheme 321
Scheme 321

Scheme 322

Scheme 322
Scheme 322

Scheme 323

Scheme 323
Scheme 323

Scheme 324

Scheme 324
Scheme 324

Scheme 325

Scheme 325
Scheme 325

Scheme 326

Scheme 326
Scheme 326

Scheme 327

Scheme 327
Scheme 327

Scheme 328

Scheme 328
Scheme 328

Scheme 329

Scheme 329
Scheme 329

Scheme 330

Scheme 330
Scheme 330

IGNITION CONDENSER DISTRIBUTORLESS IGNITION SYSTEM

Turn ignition off. Disconnect condenser 2-pin harness connector. Using DVOM measure resistance between condenser (+) and (-) terminals. Resistance should be 1 megohm at 77°F (25°C).

IGNITION COIL WITH POWER TRANSISTOR DISTRIBUTORLESS IGNITION SYSTEM

Turn ignition off. Disconnect suspect ignition coil 3-pin harness connector. Measure resistance between specified terminals. See CHECKING IGNITION COIL RESISTANCE (ALTIMA & SENTRA 2.5L) table, CHECKING IGNITION COIL RESISTANCE (MAXIMA, PATHFINDER) table or CHECKING IGNITION COIL RESISTANCE (SENTRA 1.8L) table. (Scheme 282)

Measure Between Terminals No.Specification @ 77°F (25°C)
1 & 2Except Zero Or Infinity
1 & 3Except Zero
2 & 3Except Zero

CHECKING IGNITION COIL RESISTANCE (ALTIMA, MURANO, SENTRA 2.5L & 350Z)

Measure Between Terminals No.Specification @ 77°F (25°C)Result
2 & 3ZeroNo Good
2 & 3Not ZeroGood

CHECKING IGNITION COIL RESISTANCE (MAXIMA, PATHFINDER)

Measure Between Terminals No.Specification @ 77°F (25°C)
1 & 3Except Zero Or Infinity
1 & 2Except Zero
2 & 3Except Zero

CHECKING IGNITION COIL RESISTANCE (SENTRA 1.8L)

ECM depends upon crankshaft position sensor for RPM signals. ECM uses signals to determine triggering of power transistors and fuel injectors. To test crankshaft position sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

To test camshaft position sensor, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.

Timing Advance System

ECM controls ignition timing advance based upon sensor input signals that reflect ignition timing needs. If timing problems are experienced, inspect input signals listed below for proper operation. To check input signals, see ENGINE SENSORS & SWITCHES or ECM pin voltage charts in PIN VOLTAGE CHARTS article.

  1. A/C Clutch Signal
  2. Closed Throttle Position Switch
  3. Crankshaft Position Sensor
  4. Engine Coolant Temperature
  5. Ignition (START) Signal
  6. Mass Airflow Sensor
  7. Park/Neutral Switch
  8. Power Steering Pressure Switch
  9. Throttle Position Sensor
  10. Vehicle Speed Sensor

MISCELLANEOUS CONTROLS

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate figure under COMPONENT LOCATIONS . For vacuum diagram identification, see VACUUM DIAGRAMS article.

Note. Although some of the controlled devices listed here are not technically engine performance components, they can affect driveability if they malfunction.

A/C CLUTCH RELAY

  1. A/C clutch relay is controlled by ECM. Under normal conditions, ECM will engage clutch relay by providing a ground circuit for relay windings. If ECM receives a wide open throttle signal from throttle position sensor while it is also receiving an A/C on signal from A/C auto amplifier, ECM will disengage relay.
  2. Remove A/C relay located in underhood relay box. Apply battery voltage to terminals No. 1 and 2. (Scheme 106)and (Scheme 108). Continuity should exist between terminals No. 3 and 5. When battery voltage is removed, continuity should not exist. Replace relay if continuity is not as specified.

Altima, Murano & 350Z

Electrical load signal (headlights or rear window defogger on) is transferred through CAN communication line from Body Control Module (BCM) to ECM via Intelligent Power Distribution Module (IPDM).

  1. Turn ignition on. Using CONSULT-II in DATA MONITOR mode, observe LOAD SIGNAL parameter under following conditions. See «CHECKING REAR WINDOW DEFOGGER LOAD SIGNAL (ALTIMA, MURANO & 350Z)»(ref-151938-S06086000682004010800000) table. If LOAD SIGNAL parameter displays as specified, go to next step. If parameter is not as specified, go to step 3 . CHECKING REAR WINDOW DEFOGGER LOAD SIGNAL (ALTIMA, MURANO & 350Z) Condition Load Signal Rear Window Defogger Switch ON ON Rear Window Defogger Switch OFF OFF
  2. Turn ignition on. Using CONSULT-II in DATA MONITOR mode, observe LOAD SIGNAL parameter under following conditions. See «CHECKING LIGHTING SWITCH LOAD SIGNAL (ALTIMA, MURANO & 350Z)»(ref-151938-S08944858412004010800000) table. If LOAD SIGNAL parameter displays as specified, go to next step. If parameter is not as specified, go to step 4 . CHECKING LIGHTING SWITCH LOAD SIGNAL (ALTIMA, MURANO & 350Z) Condition Load Signal Lighting Switch ON At Second Position ON Lighting Switch OFF OFF
  3. Check operation of rear window defogger. See appropriate REAR WINDOW DEFOGGERS article in ACCESSORIES & EQUIPMENT.
  4. Check operation of headlamp system.

For electrical load signal circuit diagnosis (Scheme 331)- (Scheme 334). For rear window defogger circuit check, see appropriate REAR WINDOW DEFOGGERS article in ACCESSORIES & EQUIPMENT. If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For engine control system component locations see scheme 315- see scheme 318. For ECM location, connector and terminal view (Scheme 90) For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 331

Scheme 331: Maxima
Scheme 331: Maxima

Scheme 332

Scheme 332
Scheme 332

Scheme 333

Scheme 333
Scheme 333

Scheme 334

Scheme 334
Scheme 334

For electrical load signal circuit diagnosis (Scheme 335)- (Scheme 339). For rear window defogger circuit check, see appropriate REAR WINDOW DEFOGGERS article in ACCESSORIES & EQUIPMENT. If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For engine control system component locations see scheme 325- see scheme 329. For ECM location, connector and terminal view see scheme 25 For removal and installation of components, see appropriate REMOVAL & INSTALLATION article.

Scheme 335

Scheme 335: Pathfinder
Scheme 335: Pathfinder

Scheme 336

Scheme 336
Scheme 336

Scheme 337

Scheme 337
Scheme 337

Scheme 338

Scheme 338
Scheme 338

Scheme 339

Scheme 339
Scheme 339

Sentra 1.8L ULEV

For electrical load signal circuit diagnosis (Scheme 340)- (Scheme 344). For blower motor system circuit check, see appropriate MANUAL OR AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Scheme 340

Scheme 340: Sentra 1.8L ULEV
Scheme 340: Sentra 1.8L ULEV

Scheme 341

Scheme 341
Scheme 341

Scheme 342

Scheme 342
Scheme 342

Scheme 343

Scheme 343
Scheme 343

Scheme 344

Scheme 344
Scheme 344
  1. If CONSULT-II is available, go to next step. If CONSULT-II is not available, go to step 3.
  2. Turn ignition on. Using CONSULT-II in DATA MONITOR mode, observe LOAD SIGNAL parameter under following conditions. See «CHECKING LIGHTING SWITCH LOAD SIGNAL (SENTRA 2.5L)»(ref-151938-S37801705522004010800000) table. If LOAD SIGNAL parameter displays as specified, go to next step. If parameter is not as specified, go to step 9. CHECKING LIGHTING SWITCH LOAD SIGNAL (SENTRA 2.5L) Condition Load Signal Lighting Switch ON In Second Position ON Lighting Switch OFF OFF
  3. Turn ignition on. Backprobing at ECM, measure voltage between ground and ECM terminal No. 53 (Red/White wire). (Scheme 87)and (Scheme 90). With lighting switch on, in second position, battery voltage should exist. With lighting switch off, zero volts should exist. If voltage is as specified, go to step 9. If voltage is not as specified, go to next step.
  4. Start engine. Turn headlight switch to second position. If headlights are illuminated, go to next step. If headlights are not illuminated, repair headlight system.
  5. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87) Disconnect lighting switch harness connectors (headlight switch). Connect positive DVOM lead to ECM harness connector terminal No. 53 and negative DVOM lead to lighting switch harness connector terminal No. 9 (Red/White wire at ECM changes to Red/Blue wire at lighting switch), and check for continuity. Move negative DVOM lead to terminal No. 10 (Red/White wire at ECM changes to Red/Yellow wire at lighting switch). Continuity should exist. Reverse DVOM leads, repeat test checking continuity. Continuity should not exist. (Scheme 345) Also, check circuits for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 9.
  6. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E108 and M19. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M58 and F26. Check for poor, loose, corroded or damaged terminal connections in diode M55. Check for open or short in circuits between ECM and lighting switch. If problem is found, repair as necessary. After repair, retest system.
  7. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 87) Disconnect lighting switch harness connectors (headlight switch). Connect positive DVOM lead to ECM harness connector terminal No. 53 and negative DVOM lead to lighting switch harness connector terminal No. 10 (Red/White wire at ECM changes to Red/Yellow wire at lighting switch), and check for continuity. (Scheme 87)and (Scheme 90). Reverse DVOM leads and repeat test checking continuity. Continuity should not exist. Also, check circuits for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step 9.
  8. Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E108 and M19. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M58 and F26. Check for poor, loose, corroded or damaged terminal connections in diode M55. Check for open or short in circuits between ECM and lighting switch. If problem is found, repair as necessary. After repair, retest system.
  9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

Scheme 345

Scheme 345
Scheme 345

Scheme 346

Scheme 346: Altima & Maxima
Scheme 346: Altima & Maxima
  1. If CONSULT-II is available, start engine and warm to normal operating temperature. Set parking brake and let engine idle. While depressing brake pedal, shift transmission into Drive. On CONSULT-II, select ACTIVE TEST mode and perform ENGINE MOUNTING test. Observe amount of body vibration while switching engine mounts Off and On. At idle, engine vibration should be more noticeable when mounts are on then when mounts are off. If engine mounts perform as specified, go to step 6. If engine mounts do not perform as specified, go to step 3.
  2. If CONSULT-II is not available, start engine and warm to normal operating temperature. Set parking brake and let engine idle. While depressing brake pedal, shift transmission into Drive. Observe body vibration while increasing engine speed to 1000 RPM or more. Turn ignition off. Disconnect front or rear engine mount harness connectors. (Scheme 346) Start engine and allow to idle. Observe body vibration. If body vibration is not more noticeable than vibration observed with engine running at 1000 RPM or more, go to next step. If body vibration is more noticeable than vibration than observed with engine running at 1000 RPM or more, go to step 6.
  3. For Altima, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E20 and F32. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check fuse block fuse No. 28 (10-amp). Check for open or short in White/Blue wire between electronic controlled engine mount and battery. For Maxima, Check the following: Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors E15 and F18. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Check fuse block fuse No. 59 (15-amp). Check for poor, loose, corroded or damaged terminal connections in joint connector-12. Check for open or short in White/Blue wire between electronic controlled engine mount and battery. If problem is found, repair as necessary. After repair, retest system.
  4. Disconnect ECM 116-pin harness connector. For ECM location (Scheme 88) Check continuity of White wire between front or rear engine mount harness connector terminal No. 1 and ECM harness connector terminal No. 4. (Scheme 90) Check continuity of White/Red wire between front or rear engine mount harness connector terminal No. 2 and ECM harness connector terminal No. 14. Continuity should exist. Also, check circuits for short to ground and short to voltage. If problem is found, repair circuit(s) as necessary. After repair, retest system. If no problem is found, go to next step.
  5. Visually inspect front and rear engine mounts. If problem is found, replace front and/or rear engine mounts as necessary. If no problem is found, go to next step.
  6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151937-S26600594012003010900000) in TROUBLE SHOOTING - NO CODES article.

For electronic controlled engine mount system and component testing (Scheme 347)- (Scheme 351). For ECM location, connector and terminal view see scheme 15 If problem is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Scheme 347

Scheme 347: Murano
Scheme 347: Murano

Scheme 348

Scheme 348
Scheme 348

Scheme 349

Scheme 349
Scheme 349

Scheme 350

Scheme 350
Scheme 350

Scheme 351

Scheme 351
Scheme 351

RELAYS & SOLENOIDS

Note. For ECM terminal identification, see PIN VOLTAGE CHARTS article. For harness connector locations, see ENGINE COMPARTMENT HARNESS under CONNECTOR IDENTIFICATION in appropriate SELF-DIAGNOSTICS article. For engine performance related component locations, see appropriate figure under COMPONENT LOCATIONS . For vacuum diagram identification, see VACUUM DIAGRAMS article.

See MISCELLANEOUS CONTROLS .

ECM & Fuel Pump Relays

  1. Two types of relays are used: 4-terminal and 6-terminal. For relay location, see «ECM & FUEL PUMP RELAY LOCATIONS»(ref-151938-S09884460912004010800000) table. Remove appropriate relay. Apply battery voltage and ground to terminals No. 1 and 2. (Scheme 106)and (Scheme 108).
  2. On 4-pin relays, continuity should exist between terminals No. 3 and 5. On 6-terminal relays, continuity should exist between terminals No. 3, 5, 6 and 7. On all relays, when battery voltage is removed, continuity should not exist. Replace relay, if test values are not as specified.
ApplicationLocation
Altima
ECM RelayInside IPDM Right Front Engine Compartment
Fuel Pump RelayInside IPDM Right Front Engine Compartment
Frontier & Xterra
ECM RelayAbove ECM
Fuel Pump RelayBehind Instrument Panel, Above Parking Brake Lever
Maxima
ECM RelayIn Underhood Relay Box No. 2
Fuel Pump RelayBehind Left Kick Panel
Murano
ECM RelayInside IPDM Right Front Engine Compartment
Fuel Pump RelayInside IPDM Right Front Engine Compartment
Pathfinder
ECM RelayIn Underhood Relay Box No. 2
Fuel Pump RelayBehind Left Luggage Compartment Trim
Sentra
ECM RelayAt Rear Of ECM, Accessible From Behind Glove Box
Fuel Pump RelayBehind Left Kick Panel
350Z
ECM RelayInside IPDM Right Rear Engine Compartment
Fuel Pump RelayInside IPDM Right Rear Engine Compartment

ECM & FUEL PUMP RELAY LOCATIONS

SOLENOIDS

Note. For EGR and EVAP system components, see EMISSION SYSTEMS & SUB-SYSTEMS .

Intake Valve Timing Control Solenoid Valve (1.8L Engines)

For component inspection (Scheme 352) For component and connector locations see scheme 332

Scheme 352

Scheme 352: Intake Valve Timing Control Solenoid Valve (1.8L Engines)
Scheme 352: Intake Valve Timing Control Solenoid Valve (1.8L Engines)

Intake Valve Timing Control Solenoid Valve (2.5L Engines)

For component inspection (Scheme 353) For component and connector locations, see the following

  1. On Altima see scheme 304
  2. On Sentra see scheme 344

Scheme 353

Scheme 353
Scheme 353

Intake Valve Timing Control Solenoid Valve (3.5L Engines)

  1. Disconnect intake valve timing control solenoid valve harness connector.
  2. For component inspection (Scheme 354) For component and connector locations, see the following: On Altima see scheme 308 On Maxima see scheme 315 On Murano see scheme 322 On Pathfinder see scheme 327 On 350Z see scheme 347

Scheme 354

Scheme 354
Scheme 354

More articles — Engine Controls - System & Component Testing