Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Shift Lock Control Schematics DEFINITION: Transmission shift lever does not lock in the park position with the ignition ON and the brake pedal not depressed | |||
1 | Did you perform the Symptoms - Automatic Transmission Shift Lock Control tests and all the necessary inspections? | Go to Step 2 | |
2 |
Does the shift lever move out of the PARK position without pressing the brake? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 12 |
4 | Connect a test lamp between the A/T shift lock solenoid supply voltage circuit at the automatic transmission shift lock control switch and a good ground. Does the test lamp illuminate? | Go to Step 5 | Go to Step 9 |
5 | Connect a test lamp between the A/T shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control solenoid and a good ground. Does the test lamp illuminate? | Go to Step 6 | Go to Step 13 |
6 | Connect a test lamp between the neutral safety switch signal circuit at the automatic transmission shift lock control solenoid and battery positive voltage. Does the test lamp illuminate? | Go to Step 10 | Go to Step 7 |
7 | Connect a test lamp between the neutral safety switch signal circuit at the transmission range switch and battery positive voltage. Does the test lamp illuminate? | Go to Step 14 | Go to Step 8 |
8 | Connect a test lamp between the park/neutral safety switch ground circuit at the park/neutral safety switch connector and battery positive voltage. Does the test lamp illuminate? | Go to Step 11 | Go to Step 15 |
9 |
Did you find and correct the condition? | Go to Step 19 | Go to Step 16 |
10 | Inspect for poor connections at the automatic transmission shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 19 | Go to Step 17 |
11 | Inspect for poor connections at the park/neutral safety switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 19 | Go to Step 18 |
12 | Repair the open in the automatic transmission shift lock control switch ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 19 | -- |
13 | Repair the open in the A/T shift lock control solenoid supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 19 | -- |
14 | Repair the open in the park/neutral safety switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 19 | -- |
15 | Repair the open in the park/neutral safety switch ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 19 | -- |
16 | Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the repair? | Go to Step 19 | -- |
17 | Replace the automatic transmission shift lock control solenoid. Refer to Automatic Transmission Shift Lock Actuator Replacement . Did you complete the repair? | Go to Step 19 | -- |
18 | Replace the park/neutral safety switch. Refer to Park/Neutral Position Switch Replacement . Did you complete the repair? | Go to Step 19 | -- |
19 | Operate the system in order to verify the repair? Did you find and correct the condition? | System OK | Go to Step 2 |
