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Diagnostic Procedure 1

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1990 Nissan Stanza, 1990 Nissan Sentra, 1990 Nissan Pulsar NX, 1990 Nissan Pickup, and 1990 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check power source: Locate shift lock control unit under left side of instrument panel. With ignition OFF, check for battery voltage between control unit connector terminal 2 (Red/Yellow wire) and ground, and between terminal 4 (Red/White wire) and ground. See WIRING DIAGRAMS  . If battery voltage is present in both cases, go to next step. If battery voltage is not present in both cases, check for continuity between battery and control unit connector terminals 2 and 4, and inspect fuses "X" and "M".
  2. Check ignition signal: With ignition OFF, check for battery voltage between control unit connector terminal 6 (Green/Yellow or Green/Blue wire) and ground. See WIRING DIAGRAMS  . Turn ignition ON and recheck. Voltage should be 0 Volts with ignition OFF and battery voltage should be present with ignition ON. If voltage is as specified, go to next step. If voltage is not as specified, inspect fuze "Z", ignition switch, and continuity of green/yellow (or green/blue wire) between battery and control unit.
  3. Check control unit ground circuit: Turn ignition OFF and disconnect control unit connector. Check for continuity between control unit connector terminal 9 (Black wire) and ground. See WIRING DIAGRAMS  . If continuity is not present, repair open in black wire or control unit connector. If continuity is present, go to next step
  4. Check key input signal: Reconnect control unit connector and remove key from ignition. Measure voltage between control unit connector terminal 11 (Yellow/Red wire) and ground. See WIRING DIAGRAMS  . Insert key and measure again. Voltmeter should read 0 Volts with key removed, and battery voltage with key inserted. If both voltages are okay, go to next step. If either voltage is not as specified, inspect yellow/red wire for continuity, and inspect fuse "M". If okay, go to step 10).
  5. Check shift detention switch input signal: Turn ignition on and set gear selector lever in "P" and release selector lever button. Measure voltage between control unit conector terminal 5 (Yellow/Red wire) and ground. See WIRING DIAGRAMS  . Voltage should be 0 Volts. Turn igniton ON, depress brake pedal, push selector lever button and recheck. Voltmeter should read battery voltage. Release brake and move gear selector lever out of "P". Voltmeter should read battery voltage in any position other than "P". If any voltage is not as specified, go to step 11) and 12). If all voltages are as specified, go to next step.
  6. Check stoplamp switch input signal: With ignition on, measure voltage between control unit connector terminal 3 (Red/Green wire) and ground. See WIRING DIAGRAMS  . With brake pedal released voltmeter should read 0 Volts, and with brake pedal depressed voltmeter should read battery voltage. If both voltages are asspecified, go to next step. If either voltage is not as specified, go to step 13).
  7. Check shift lock solenoid output signal: Place gear selector lever in "P". With ignition on, check voltage between shift lock solenoid connector terminal 1 (Blue/Green wire) and ground. See WIRING DIAGRAMS  . With brake pedal released, voltmeter should read 0 Volts. With brake pedal depressed, voltmeter should read battery voltage. Turn ignition off and measure voltage again. Voltmeter should read 0 Volts. If all voltages are as specified, go to next step. If any voltages are not as specified, check continuity in blue green wire between shift lock control unit and shift lock solenoid.
  8. Check shift lock solenoid ground circuit: Disconnect shift lock solenoid connector and check continuity between shift lock solenoid connector terminal 9 (Black wire) and ground. See WIRING DIAGRAMS  . If continuity exists, go to next step. If continuity does not exist, repair open in black wire or connector.
  9. Check shift lock solenoid: Verify operation of solenoid by applying battery voltage to shift lock solenoid terminal 1 (Blue/Green wire) and battery ground to terminal 9 (Black wire). See WIRING DIAGRAMS  . Replace as necessary. Reconnect shift lock solenoid connector and turn ignition on. Now check for normal shift lock operation. If shift lock system still does not operate properly, inspect system connectors, and see CONTROL UNIT INSPECTION  table.
  10. Inspect key switch (located on ignition switch): Disconnect 3-pin key switch connector and check for continuity, on switch side of connector, between terminals 4 (Red/White wire) and 11 (Yellow/Red wire). See WIRING DIAGRAMS  . There should be continuity with key inserted, and not continuity with key removed. Replace switch if resistance is not as specified.
  11. Inspect shift detent switch (located at base of selector lever): Disconnect shift lock solenoid connector and check for continuity, on switch side of connector, between terminals 5 (Yellow/Red wire) and 11 (Yellow/Red wire). See WIRING DIAGRAMS  . There should be continuity with selector lever in "P", or any position except "P" with selector lever button depressed. There should be no continuity when conditions are except as above. Replace switch if resistance is not as specified.
  12. Inspect key detent switch (located at base of selector lever): Disconnect shift lock solenoid connector and check for continuity, on switch side of connector, between terminals 12 (Blue/White wire) and 11 (Yellow/Red wire). See WIRING DIAGRAMS  . There should be continuity with selector lever in "P", or any position except "P" with selector lever button depressed. There should be no continuity when conditions are except as above. Replace switch if resistance is not as specified.
  13. Inspect stoplamp switch: Disconnect stoplamp switch connector and check for continuity between both terminals on switch side of connector. See WIRING DIAGRAMS  . There should be continuity with brake pedal depressed, and no continuity with brake pedal released. Replace switch if resistance is not as specified.
CONTROL UNIT INSPECTION

Voltmeter + Term. To: Voltmeter - Term. To: Condition Result (Volts)
1 9 Key ON, Selector In "P" Brake Depressed Key OFF, Selector Not In Brake Not Depressed Battery Volts
2 9 Key OFF Battery Volts
3 9 Brake Depressed Brake Not Depressed Battery Volts
4 9 Key OFF Battery Volts
5 9 Key In, Selector Lever In Any Position But "P", Or In "P" With Lever Button Depressed All Conditions Except Above Battery Volts
6 9 Key ON Battery Volts
8 10 Key Turned From OFF, ACC Or LOCK To ON Battery Volts
10 8 Key Turned From ON To LOCK, OFF, Or ACC (1)
11 10 Key In, Key Out Battery Volts
12 10 Key In, Selector Lever In Any Position But "P", Or In "P" With Lever Button Depressed All Conditions Except Above Battery Volts
(1) Battery voltage for approximately 0.1 seconds.
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