Pinpoint Test B: O/D (Overdrive) Does Not Operate Correctly

External Controls

PINPOINT TEST B : O/D (Overdrive) DOES NOT OPERATE CORRECTLY

NOTE: Refer to the Electrical Connectors illustration preceding these pinpoint tests. Electrical Connectors

B1 CHECK VOLTAGE TO THE O/D (Overdrive) SWITCH

- Ignition ON.

- Disconnect: Floor Shifter C3245.

- Measure circuit 15-TA21 (GN/BK) for voltage at floor shifter C3245-5.





Is the voltage greater than 10 volts?

Yes
GO to B2.

No
REPAIR circuit 15-TA21 (GN/BK) for an open. TEST the system for normal operation.

B2 CHECK THE O/D (Overdrive) SWITCH

- Measure the resistance between floor shifter C3245-5 and C3245-6, component side, while cycling the O/D switch.





Is the resistance less than 5 ohms when pressed and greater than 10,000 ohms when released?

Yes
GO to B3.

No
CHECK the floor shifter harness for broken or damaged wires. If harness is OK, INSTALL a new selector lever knob.

B3 CHECK THE O/D (Overdrive) SWITCH CIRCUIT FOR A SHORT TO GROUND

- Disconnect: PCM C175T.

- Inspect PCM connector for damaged or pushed-out pins, corrosion or loose wires. Repair as necessary.

- Measure the resistance between floor shifter C3245-6, circuit 15S-TA21 (GN/BK) and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to B4.

No
REPAIR circuit 15S-TA21 (GN/BK). TEST the system for normal operation.

B4 CHECK THE O/D (Overdrive) SWITCH CIRCUIT FOR AN OPEN

- Measure the resistance of circuit 15S-TA21 (GN/BK) between PCM C175T-30 and floor shifter C3245-6.





Is the resistance less than 5 ohms?

Yes
INSTALL a new PCM. TEST the system for normal operation.

No
REPAIR circuit 15S-TA21 (GN/BK). TEST the system for normal operation.