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Automatic Transmission Shift Interlock System: Other Nissan Pathfinder II

Automatic Trans 8 illustrations ~2071 words

SHIFT LOCK SYSTEM

Start vehicle and depress brake pedal. Move shift lever to desired position. Shift lock solenoid will not be energized unless ASCD cancel/brake switch is operated by depressing brake pedal with ignition switch in ON position.

KEY LOCK SYSTEM

Insert key in ignition switch and turn to ACC or ON position. Shift lever can be moved once brake pedal is depressed. Move shift lever to Park position, then turn ignition switch to LOCK position and remove key. Shift interlock cable prevents ignition switch from being turned to LOCK position unless shift lever is in Park position.

ALTIMA, PATHFINDER & QX4

Note. For wire color identification, see WIRING DIAGRAMS .

Selector Lever Can Or Cannot Be Moved From Park Position With Key In On Position & Brake Pedal Applied Or, Selector Lever Can Or Cannot Be Moved From Park Position When Key Is Removed From Key Cylinder

  1. Ensure selector lever is not damaged. Check power source. With ignition on, measure voltage between ASCD cancel switch harness terminal No. 2 and ground. (Scheme 95) Battery voltage should be present. If no voltage is present, check harness for open or short. Inspect fuse and ignition switch power source.
  2. Check ASCD cancel switch. With ignition on, measure voltage between shift lock solenoid and park position switch harness terminal No. 1 and ground. With brake pedal depressed, zero volts should be present. With brake pedal released, battery voltage should be present. If voltage is not as specified, check harness for open or short between shift lock solenoid and park position switch harness connector No. 6 and ASCD cancel switch harness connector No. 1. If circuit is okay, inspect ASCD cancel switch. See appropriate test in «COMPONENT TESTS»(ref-9410-S06514897162000102300000).
  3. Check ground circuit. With ignition in OFF position. Disconnect shift lock solenoid and park position switch harness connector. Check continuity between shift lock solenoid and park position switch harness terminal No. 6 and ground. If no continuity exists, repair or replace harness or connector.
  4. Check park position switch and shift lock solenoid. See appropriate tests in «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Reconnect shift lock solenoid and park position switch harness connector. With ignition on, recheck shift lock operation.

Scheme 95

Scheme 95
Scheme 95

Scheme 96

Scheme 96
Scheme 96
  1. Ensure selector lever is not damaged. Check power source. With ignition on, measure voltage between ASCD cancel switch harness terminal No. 1 and ground. (Scheme 95)or (Scheme 96). Battery voltage should be present. If no voltage is present, check harness for open or short. Inspect fuse and ignition switch power source.
  2. Check ASCD cancel switch. With ignition on, measure voltage between shift lock solenoid and park position switch harness terminal No. 2 and ground. With brake pedal depressed, zero volts should be present. With brake pedal released, battery voltage should be present. If voltage is not as specified, check harness for open or short between shift lock solenoid and park position switch harness connector No. 2 and ASCD cancel switch harness connector No. 2. If circuit is okay, inspect ASCD cancel switch. See appropriate test in «COMPONENT TESTS»(ref-9410-S06514897162000102300000).
  3. Check ground circuit. With ignition in OFF position. Disconnect shift lock solenoid and park position switch harness connector. Check continuity between shift lock solenoid and park position switch harness terminal No. 1 and ground. If no continuity exists, repair or replace harness or connector.
  4. Check park position switch and shift lock solenoid. See appropriate tests in «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Reconnect shift lock solenoid and park position switch harness connector. With ignition on, recheck shift lock operation.

Q45

Note. For wire color identification, see WIRING DIAGRAMS . For shift lock control unit harness connector terminal identification, see SHIFT LOCK CONTROL UNIT (Q45) under COMPONENT TESTS.

Selector Lever Cannot Be Moved From Park Position With Key In & With Brake Pedal Applied Or, Selector Lever Can Be Moved From Park Position When Key Is Removed From Key Cylinder

  1. Check power source. Access Shift Lock Control Unit (SLCU). (Scheme 97) Ensure ignition is off. Using voltmeter, backprobe SLCU connector. Measure voltage between ground and terminal No. 1 (Blue/Black wire). Battery voltage should be present. If no voltage is present, check harness for open or short. Inspect fuse No. 26 (20-amp) in junction block fuse block.
  2. Check ignition power source. Ensure ignition is off. Using voltmeter, backprobe SLCU connector. Measure voltage between ground and terminal No. 5 (Red/Green wire). No voltage should be present. Turn ignition on. Battery voltage should be present. If voltage is not as specified, check harness for open or short. Inspect fuse No. 32 (7.5-amp) in junction block fuse block.
  3. Check ground circuit. Turn ignition off. Disconnect SLCU connector. Check continuity between terminal No. 7 on SLCU harness connector and ground. If no continuity exists, repair or replace harness or connector.
  4. Check key switch input signal. Connect SLCU connector. Remove key from ignition switch. Using voltmeter, backprobe A/T device connector. (Scheme 98) Measure voltage between ground and terminal No. 5 (Yellow/Red wire). (Scheme 99) No voltage should be present. Insert key into ignition switch. Battery voltage should exist. If voltage is not as specified, inspect key switch, open or short between key switch and A/T device. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Inspect fuse No. 28 (10-amp) in junction block fuse block. Repair as necessary.
  5. Check detention switch input signal. Turn ignition on. Ensure shift lever is in Park position. Using voltmeter, backprobe SLCU connector. Measure voltage between ground and terminal No. 4 (Green/White wire). No voltage should be present. If voltage is not as specified, inspect detention switch. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000).
  6. With voltmeter connected (backprobing) to terminal No. 5 on SLCU harness connector, ensure ignition is in ON position and shift lever is in Park position. Depress brake pedal. Push shift lever release button. Battery voltage should be present. Move shift lever to any other position. Voltage should not change. If voltage is not as specified, inspect harness for open or short. Inspect detention switch. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Repair as necessary.
  7. Check brake switch signal. With ignition on, measure voltage (backprobing) between terminal No. 8 (Red Wire) on SLCU harness connector and ground. With brake pedal depressed, battery voltage should be present. With brake pedal released, zero volts should be present. If voltage is not as specified, check harness for open or short between SLCU and brake switch. If circuit is okay, inspect brake light switch.
  8. Check output signal. Turn ignition on. Access A/T device connector. (Scheme 98) Measure voltage (backprobing) between terminal No. 6 (Blue/Yellow Wire) on A/T device harness connector and ground. With brake pedal depressed, battery voltage should be present. With brake pedal released, zero volts should be present. Turn ignition off. No voltage should be present. If voltage is not as specified, inspect and repair harness for open or short.
  9. Inspect shift lock system operation. If system is not functioning correctly, inspect shift lock solenoid. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Repair as necessary.

Scheme 97

Scheme 97
Scheme 97

Scheme 98

Scheme 98
Scheme 98

Scheme 99

Scheme 99
Scheme 99

Key Cannot Be Removed From Ignition Switch With Shift Lever In Park Position Or Key Can Be Removed From Ignition Switch With Shift Lever In Any Position Other Than Park

  1. Check power source. Access Shift Lock Control Unit (SLCU). (Scheme 97) Ensure ignition is off. Using voltmeter, backprobe SLCU connector. Measure voltage between ground and terminal No. 1 (Blue/Black wire). Battery voltage should be present. If no voltage is present, check harness for open or short. Inspect fuse No. 26 (20-amp) in junction block fuse block.
  2. Check ignition power source. Ensure ignition is off. Using voltmeter, backprobe SLCU connector. Measure voltage between ground and terminals No. 3 (Orange wire) and No. 5 (Red/Green wire). No voltage should be present. Turn ignition switch to ACC position. Battery voltage should only be present on terminal No. 3. Turn ignition switch to ON position. Battery voltage should be present on terminal No. 5. If voltage is not as specified, check harness for open or short. Inspect fuses No. 9 and 32 (7.5-amp) in junction block fuse block.
  3. Check ground circuit. Turn ignition off. Disconnect SLCU connector. Check continuity between terminal No. 7 on SLCU harness connector and ground. If no continuity exists, repair or replace harness or connector.
  4. Check key switch input signal. Connect SLCU connector. Remove key from ignition switch. Using voltmeter, backprobe A/T device harness connector. (Scheme 98) Measure voltage between ground and terminal No. 5 (Yellow/Red wire). (Scheme 99) No voltage should be present. Insert key into ignition switch. Battery voltage should exist. If voltage is not as specified, inspect key switch, open or short between key switch and SLCU. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Repair as necessary.
  5. Check detention switch key input signal. Turn ignition on. Ensure shift lever is in Park position. Using voltmeter, backprobe SLCU connector. Measure voltage between ground and terminal No. 2 (Green/Yellow wire). No voltage should be present. If voltage is not as specified, inspect detention switch. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000).
  6. With voltmeter connected (backprobing) to terminal No. 2 on SLCU harness connector, ensure ignition is in ON position and shift lever is in Park position. Depress brake pedal. Push shift lever release button. Battery voltage should be present. Move shift lever to any other position. Voltage should not change. If voltage is not as specified, inspect harness for open or short. Inspect detention switch. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Repair as necessary.
  7. Ensure shift lever is in Park position. Turn ignition off. Access key lock solenoid. (Scheme 100) Measure voltage (backprobe) between ground and terminal No. 2 (Blue wire) on solenoid harness connector. Monitor voltage while turning ignition on. Voltmeter should display a pulse of battery voltage. If voltage is not as specified, inspect harness between key lock solenoid and SLCU for open or short. Repair as necessary. If harness is okay, replace SLCU.
  8. With voltmeter connected to key lock solenoid connector terminal No. 2, depress and hold brake pedal and shift lever button. Monitor voltage while turning ignition off. Voltmeter should display a pulse of battery voltage. If voltage is not as specified, replace SLCU. If voltage is as specified, inspect key lock solenoid. See «COMPONENT TESTS»(ref-9410-S06514897162000102300000). Replace as necessary.
  9. Check ground circuit. Turn ignition off. Disconnect key lock solenoid connector. Check continuity between terminal No. 1 (Black wire) on harness connector and ground. If no continuity exists, repair or replace harness or connector.

Scheme 100

Scheme 100
Scheme 100

COMPONENT TESTS

Note. For wire color and terminal identification, see WIRING DIAGRAMS .

ASCD BRAKE SWITCH

Disconnect ASCD brake switch harness connector. Check continuity between switch terminals. With brake pedal released, continuity should exist. With brake pedal depressed, no continuity should exist. If continuity is not as specified, ensure switch is adjusted correctly. Replace as necessary.

DETENTION SWITCH

  1. Disconnect shift lock solenoid harness connector, located below shift lever housing. (Scheme 98) Check for continuity between terminals No. 5 and 6 on shift lock solenoid harness connector. Continuity should only exist with shift lever in Park position and shift lever button depressed or with shift lever in any position other than Park and shift lever button released.
  2. Check for continuity between terminals No. 5 and 7 on shift lock solenoid harness connector. Continuity should only exist with shift lever in Park position and shift lever button depressed or with shift lever in any position other than Park and shift lever button released.

KEY LOCK SOLENOID

Apply fused battery voltage between key lock solenoid terminals. With voltage applied, solenoid should operate. Replace solenoid as necessary.

KEY LOCK SWITCH

Disconnect key lock switch harness connector. (Scheme 100) Check continuity between switch terminals No. 3 and 4. With key inserted, continuity should exist. With key removed, no continuity should exist. If continuity is not as specified, ensure switch is adjusted correctly. Replace as necessary.

PARK POSITION SWITCH

Disconnect park position switch harness connector. Check continuity between switch terminals. With selector lever set in "P" position, continuity should exist. In any other condition, no continuity should exist.

SHIFT LOCK CONTROL UNIT (Q45)

Using voltmeter, backprobe Shift Lock Control Unit (SLCU) connector. Measure voltage between SLCU terminals. (Scheme 101)

Scheme 101

Scheme 101: SHIFT LOCK CONTROL UNIT (Q45)
Scheme 101: SHIFT LOCK CONTROL UNIT (Q45)

SHIFT LOCK SOLENOID

Apply fused battery voltage between shift lock solenoid terminals. With voltage applied, solenoid should operate. Replace solenoid as necessary.

KEY INTERLOCK CABLE

Note. Ensure key interlock cable is installed without sharp bends, twists or interference with adjacent parts. Ensure casing cap and bracket are secured firmly. If casing cap can be removed with a load of less than 8.8 lbs (39.2 N), replace key interlock cable. (Scheme 102)

Scheme 102

Scheme 102: KEY INTERLOCK CABLE
Scheme 102: KEY INTERLOCK CABLE

Note. Information is only available for Frontier and Quest.

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