Pinpoint Test C: Transmission Control Switch
- C1 RETRIEVE AND RECORD ALL DTCS
- Using the diagnostic scan tool, retrieve all Diagnostic Trouble Codes (DTCs).
Is DTC P1780 present?
- Yes : GO to C2
- No : REFER to: INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES
- C2 CHECK THE BCM (BODY CONTROL MODULE) FUSE
- Ignition OFF.
- Remove the BCM fuse 85 (7.5A).
- CHECK Fuse 85 (7.5A).
Is the resistance less than 3 ohms?
- Yes : GO to C6
- No : GO to C3
- C3 CHECK THE BCM (BODY CONTROL MODULE) FOR AN INTERNAL SHORT
- Disconnect BCM C2280F .
- Inspect the connectors for damaged or pushed-out terminals.
- Install a new fuse.
Did the fuse fail?
- Yes
: INSTALL a new BCM
.
REFER to: BODY CONTROL MODULE (BCM)
- No : GO to C4
- C4 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) POWER CIRCUIT FOR A SHORT TO GROUND
- Disconnect Floor Shifter C3245.
- Measure.
Click to display connectors
Positive Lead Measurement/Action Negative Lead C2280F-17 Ground
Is the resistance greater than 10, 000 ohms?
- Yes : GO to C5
- No : REPAIR the circuit.
- C5 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) INPUT CIRCUIT FOR A SHORT TO GROUND
- Disconnect PCM C175B .
- Measure.
Click to display connectors
Positive Lead Measurement/Action Negative Lead C175B-5 Ground
Is the resistance greater than 10, 000 ohms?
- Yes : GO to C8
- No : REPAIR the circuit.
- C6 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) POWER CIRCUIT FOR AN OPEN
- Disconnect Floor Shifter C3245 .
- Measure.
Click to display connectors
Positive Lead Measurement/Action Negative Lead C3245-2 C2280F-17
Is the resistance less than 3 ohms?
- Yes : GO to C7
- No : REPAIR the circuit.
- C7 CHECK THE TCS (TRANSMISSION CONTROL SWITCH) INPUT CIRCUIT FOR AN OPEN
- Disconnect PCM C175B .
- Measure.
Click to display connectors
Positive Lead Measurement/Action Negative Lead C3245-3 C175B-5
Is the resistance less than 3 ohms?
- Yes : GO to C8
- No : REPAIR the circuit.
- C8 CHECK THE TCS (TRANSMISSION CONTROL SWITCH)
- Measure.
Click to display connectors
Positive Lead Measurement/Action Negative Lead Component side TCS pin 2. Component side TCS pin 3.
Is the resistance less than 1.5 ohms with the switch pressed and greater than 10, 000 ohms when released?
- Yes : GO to C9
- No
: INSTALL a new selector lever knob.
REFER to: SELECTOR LEVER KNOB
- Measure.
- C9 CHECK THE PCM (POWERTRAIN CONTROL MODULE)
- Install fuse 85 (7.5A).
- Connect Floor Shifter C3245.
- Ignition ON.
- Measure.
Click to display connectors
Positive Lead Measurement/Action Negative Lead C175B-5 Ground
Is the voltage greater than 10 volts with the switch pressed and less than 5 volts when released?
- Yes
: INSTALL a new PCM
.
REFER to: POWERTRAIN CONTROL MODULE (PCM)
PROGRAM the PCM with the latest calibration level.
- No : REPAIR the circuit.