TEST ACTION APPLICABILITY
4 Ignition Off
Disconnect the Powertrain Control Module.
Disconnect the Transmission Range Sensor.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Park/Neutral Position Switch Sense Circuit at
the Powertrain Control Module Connector and ground.
While moving gear selector through all gear positions, watch the ohmmeter.
Did the display still remain below 5.0 ohms?All
Ye s®Repair P/N Switch Sense Ckt for a short to ground.
Perform Powertrain Verification Test VER-2A.
No®Test Complete.
5 Ignition Off
Disconnect the Powertrain Control Module.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Park/Neutral Position Switch Sense Circuit at
the Powertrain Control Module Connector and ground.
While moving gear selector through all gear positions, watch the ohmmeter.
Did the display switch from below 5.0 ohms to above 5.0 ohms?All
Ye s®Replace the Powertrain Control Module.
Perform Powertrain Verification Test VER-2A.
No®Go To 6
6 Ignition Off
Disconnect the Powertrain Control Module.
Disconnect the Transmission Range Sensor (TRS) Connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Park/Neutral Position Switch Sense Circuit from the
PCM Connector to the TRS Connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 7
No®Repair open P/N Position Switch Sense Ckt.
Perform Powertrain Verification Test VER-2A.
7 If there are no potential causes remaining, the Transmission Range Sensor or the
P/N Switch is assumed to be defective.
View repair options.All
Repair
Replace the Transmission Range Sensor or P/N Switch.
Perform Powertrain Verification Test VER-2A.
250
DRIVEABILITY
* CHECKING PARK/NEUTRAL POSITION SWITCH ÐContinued
ProCarManuals.com
Symptom:
* CHECKING SECONDARY IGNITION
POSSIBLE CAUSES
SECONDARY IGNITION OUT OF SPECIFICATION
IGNITION COIL DEFECTIVE
SECONDARY IGNITION SYSTEM DEFECTIVE (WATER TEST)
TEST ACTION APPLICABILITY
1 Ignition Off.
Connect a suitable Engine Analyzer to the Engine.
Start Engine.
Allow Engine to idle.
Note: If the Engine will not idle, maintain a constant RPM above idle.
Note: Set the Scope to read, display or parade pattern.
Follow the equipment manufacturer's procedure for pattern analysis.
Is the secondary ignition pattern ok?All
Ye s®Go To 2
No®Repair the indicated component in the Secondary Ignition Sys-
tem.
Perform Powertrain Verification Test VER-2A.
2 Ignition Off
Connect a suitable Engine Analyzer to the engine.
Start the Engine and allow it to idle.
Note: If the engine will not idle, maintain a constant RPM above idle.
Set scope to read display or parade pattern.
Follow the equipment manufacturer's procedure for pattern analysis.
Note: Do not spray the Inductive Pickup.
With a spray bottle, spray the Ignition Cables with water and monitor Ignition
Pattern.
Did the Ignition Pattern change?All
Ye s®Repair the indicated component in the Secondary Ignition Sys-
tem.
Perform Powertrain Verification Test VER-2A.
No®Go To 3
3 Ignition Off
Connect a suitable Engine Analyzer to the engine.
Start the engine and allow it to idle.
Note: If the engine will not idle, maintain a constant RPM above idle.
Note: Set the scope to read display or parade pattern.
Follow the equipment manufacturer's procedure for pattern analysis.
Momentarily remove and reinstall the Spark Plug Wires.
While disconnecting each wire, observe the secondary KV line.
Is the open circuit Secondary voltage at least 25KV?All
Ye s®Test Complete.
No®Replace the Ignition Coil.
Perform Powertrain Verification Test VER-2A.
252
DRIVEABILITY
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Symptom:
SPEED CONTROL ON/OFF SWITCH
POSSIBLE CAUSES
CLOCKSPRING DEFECTIVE
PCM DEFECTIVE (SPEED CONTROL ON/OFF/SET SWITCH)
SPEED CONTROL GROUND CIRCUIT TO SWITCH OPEN
SPEED CONTROL ON/OFF SWITCH DEFECTIVE
SPEED CONTROL ON/OFF SWITCH SIGNAL CIRCUIT OPEN
SPEED CONTROL ON/OFF SWITCH SIGNAL CIRCUIT SHORT TO GROUND
SPEED CONTROL ON/OFF SWITCH TERMINAL DAMAGED
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIII, monitor the Speed Control Switch inputs.
While observing the display, press the Speed Control ªONº switch.
Does the DRBIII show S/C on/off ªONº?All
Ye s®Test Complete.
Perform Powertrain Verification Test VER-4A.
No®Go To 2
2 Ignition Off
Disconnect the Speed Control On/Off and Set Switch.
Note: Check connectors - Clean/repair as necessary.
Is any terminal damaged, pushed out or miswired?All
Ye s®Repair as necessary.
Perform Powertrain Verification Test VER-4A.
No®Go To 3
3 Ignition Off
Disconnect the Speed Control On/Off and Set Switch.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the S/C Ground Circuit at the S/C
ON/OFF, SET Switch Connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 4
No®Repair the open Speed Control Ground Circuit to Switch.
Perform Powertrain Verification Test VER-4A.
264
SPEED CONTROL
ProCarManuals.com
TEST ACTION APPLICABILITY
4 Ignition Off
Disconnect the Speed Control On/Off and Set Switch.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire across the S/C Sw Signal Circuit to Ground Circuit.
Ignition On, Engine Not Running.
With the DRBIII, read the S/C Switch voltage.
Does the DRBIII display 0.00 volts?All
Ye s®Replace the S/C ON/OFF and SET Switch.
Perform Powertrain Verification Test VER-4A.
No®Go To 5
5 Ignition Off
Disconnect the Speed Control On/Off and Set Switch.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the S/C Switch Signal at the S/C
ON/OFF, SET Switch Connector to ground.
Is the resistance below 5.0 ohms?All
Ye s®Repair the Speed Control Switch Signal Circuit for a short to
ground.
Perform Powertrain Verification Test VER-4A.
No®Go To 6
6 Ignition Off
Disconnect the Powertrain Control Module.
Disconnect the Clockspring 4±way to I/P Harness.
Note: Check connectors - Clean/repair as necessary.
Using an ohmmeter, test the S/C Switch Signal Circuit, Clockspring to PCM.
Is the resistance below 5.0 ohms?All
Ye s®Go To 7
No®Repair the open Speed Control Switch Signal Circuit.
Perform Powertrain Verification Test VER-4A.
7 Ignition Off
Disconnect the Speed Control On/Off and set Switch.
Disconnect the Powertrain Control Module.
Note: Check connectors - Clean/repair as necessary.
Using an ohmmeter, measure the S/C Switch Signal Ckt, Switch to PCM.
Is the resistance below 5.0 ohms?All
Ye s®Replace the Powertrain Control Module.
Perform Powertrain Verification Test VER-4A.
No®Go To 8
8 If there are no potential causes remaining, the Clockspring is assumed to be
defective.
View repair options.All
Repair
Replace the Clockspring.
Perform Powertrain Verification Test VER-4A.
265
SPEED CONTROL
SPEED CONTROL ON/OFF SWITCH ÐContinued
ProCarManuals.com
Symptom:
* CHECKING SPEED CONTROL OPERATION
POSSIBLE CAUSES
BRAKE SWITCH DEFECTIVE
GROUND CIRCUIT OPEN
S/C BRAKE SWITCH OUTPUT CIRCUIT SHORTED TO GROUND
SPEED CONTROL BRAKE SWITCH OUTPUT SUPPLY CKT OPEN
SPEED CONTROL ON/OFF/SET SWITCH DEFECTIVE
SPEED CONTROL POWER SUPPLY CIRCUIT OPEN
SPEED CONTROL POWER SUPPLY CIRCUIT SHORTED/GROUND
SPEED CONTROL SERVO CONNECTOR OBSERVABLE DEFECT
SPEED CONTROL SWITCH DEFECTIVE
CLOCK SPRING DEFECTIVE
SPEED CONTROL SERVO DEFECTIVE
SPEED CONTROL THROTTLE CABLE DEFECTIVE
SPEED CONTROL VACUUM SUPPLY LEAKS OR RESTRICTED
PCM DEFECTIVE (SPEED CONTROL OPERATION)
VACUUM RESERVOIR DEFECTIVE
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running
With the DRB, monitor the Speed Control Switch inputs.
While observing display, press the Speed Control ON/OFF switch.
Does the DRB show S/C ON/OFF switch9ON9?All
Ye s®Go To 2
No®Refer to symptom SPEED CONTROL ON/OFF SWITCH in the
SPEED CONTROL category.
2 Ignition On, Engine Not Running
Press the S/C ON/OFF button to select S/C ªON.º
With the DRB, monitor the Speed Control Switch inputs.
While observing the DRB, press the ACCEL/RESUME/CANCEL and DECEL
switches several times.
Do all of the Switches toggle correctly between pressed and released?All
Ye s®Go To 3
No®Go To 25
266
SPEED CONTROL
ProCarManuals.com
TEST ACTION APPLICABILITY
3 Ignition On, Engine Not Running
Press the S/C ON/OFF button to select S/C ªON.º
With the DRB, monitor the Speed Control Switch inputs.
While observing display, press the Set Switch several times.
Does the DRB show the Set Switch pressed and released?All
Ye s®Go To 4
No®Replace the Speed Control On/Off/Set Switch.
Perform Powertrain Verification Test VER-4A.
4 Ignition On, Engine Not Running
With the DRB, monitor the Speed Control Switch inputs.
While observing display, press the Brake Pedal several times.
Does the DRB show Brake Switch Status change between pressed and released?All
Ye s®Go To 5
No®Refer to symptom SPEED CONTROL BRAKE SWITCH OUT-
PUT in the SPEED CONTROL category.
5 Ignition On, Engine Not Running
With the DRB, monitor the Speed Control Switch inputs.
While observing the display, move the Gear Selector to Drive.
Does the DRB show the Park/Neutral Switch in D/R?All
Ye s®Go To 6
No®Refer to symptom CHECKING PARK/NEUTRAL POS SWITCH
in the SPEED CONTROL category.
6 Ignition Off
Disconnect the Speed Control Servo Connector.
Note: Check connectors - Clean/repair as necessary.
Turn the Ignition on and the S/C on.
Using a Voltmeter measure voltage of the S/C Brake Switch Output Ckt at Servo
Conn.
Is the voltage above 10 volts?All
Ye s®Go To 7
No®Go To 14
7 Ignition Off
Start engine, allow to idle 1 minute.
Turn Engine off, (Ignition on).
With the DRB, actuate the Speed Control Servo Solenoids.
Does the Throttle open and close?All
Ye s®Refer to symptom SPEED CONTROL DENIED MESSAGE in the
SPEED CONTROL category.
No®Go To 8
8 Ignition Off
Inspect the Speed Control Throttle Cable.
Is the Cable disconnected or damaged?All
Ye s®Repair as necessary.
Perform Powertrain Verification Test VER-4A.
No®Go To 9
267
SPEED CONTROL
* CHECKING SPEED CONTROL OPERATION ÐContinued
ProCarManuals.com
TEST ACTION APPLICABILITY
25 Ignition On.
With the DRB Select ªInputs/Outputsº, monitor the S/C Switch.
Press and hold each switch to see change in the parameter.
Does the parameter change for each switch?All
Ye s®Go To 26
No®Replace the S/C Switch.
Perform Powertrain Verification Test VER-4A.
26 Ignition On, Engine Not Running
With the DRB, monitor the Speed Control Switch inputs.
While observing display, press the Set Switch several times.
Does the DRB show the Set Switch pressed and released?All
Ye s®Go To 27
No®Replace the Speed Control On/Off/Set Switch.
Perform Powertrain Verification Test VER-4A.
27 If there are no potential causes remaining, the Clock Spring is assumed to be
defective.
View repair options.All
Repair
Replace Clock Spring.
Perform Powertrain Verification Test VER-4A.
271
SPEED CONTROL
* CHECKING SPEED CONTROL OPERATION ÐContinued
ProCarManuals.com
Symptom:
*(NO RESPONSE(CONDITION
POSSIBLE CAUSES
IGNITION NOT ON
DIAGNOSTIC READ-OUT BOX ADAPTER CABLE DEFECTIVE
FUEL PUMP DEFECTIVE
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
PCM GROUNDS OPEN
FUEL PUMP RELAY OUT CKT INTERMITTENT SHORT TO GRND
FUEL PUMP RELAY OUTPUT CIRCUIT SHORT TO GROUND
SCI RECEIVE CIRCUIT OPEN
SCI RECEIVE CIRCUIT SHORT TO GROUND
SCI TRANSMIT CIRCUIT OPEN
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
FUSED B(+) CIRCUIT OPEN BETWEEN FUSE AND BATTERY
DIAGNOSTIC READ-OUT BOX DEFECTIVE
PCM DEFECTIVE (NO RESPONSE)
FUSED B(+) CIRCUIT OPEN BETWEEN FUSE AND PCM
FUSED B(+) CIRCUIT SHORT TO GROUND
TEST ACTION APPLICABILITY
1 Attempt to start vehicle.
Does the vehicle start?All
Ye s®Go To 2
No®Go To 12
2 Was the Ignition on when the ªNo Responseº message was displayed? All
Ye s®Go To 3
No®Turn the ignition on to get a response.
3 Ignition off.
Using an Ohmmeter, measure the DLC ground circuit (terminals 4 and 5) to ground.
Is the resistance below 5.0 ohms for each measurement?All
Ye s®Go To 4
No®Repair the open ground circuit(s).
Perform Powertrain Verification Test VER-1A.
272
STARTING
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