Chrysler RG Voyager. Manual - part 423

TEST

ACTION

APPLICABILITY

WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?

All

Yes

→ Repair as necessary.

Perform ROAD TEST VERIFICATION - VER-2.

→ Test Complete.

195

DRIVEABILITY - DIESEL

P1685-SKIM SYSTEM SKIM ERROR —

Continued

Symptom List:

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY
P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY
WITH BRAKE SWITCH
P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY
WITH LOW IDLE SWITCH
P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY
WITH POTENTIOMETER
P2120-ACC PEDAL POSITION SENSOR 1 CKT SIGNAL VOLTAGE
TOO HIGH
P2120-ACC PEDAL POSITION SENSOR 1 CKT SIGNAL VOLTAGE
TOO LOW
P2120-ACC PEDAL POSITION SENSOR 1 CKT SUPPLY VOLTAGE
TOO HIGH OR LOW

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P2120-ACC PEDAL POSITION
SENSOR 1 CKT PLAUSIBILITY.

When Monitored and Set Condition:

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY

When Monitored:

With the ignition on.

Set Condition:

The Accelerator Pedal Position Sensor Signal is below 1.6% or above 17.6%

and the idle switch is not in the correct state. NOTE: The idle switch is designed to
transition when the accel position is approximately 16% (1.00 volt). This code sets the ECM
to Limp-in Mode, which includes a fixed engine speed of 1100 RPM.

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY WITH BRAKE
SWITCH

When Monitored:

With the ignition on.

Set Condition:

The ECM detects the Accelerator Pedal and the Brake Pedal have been

depressed at the same time for longer than the allowable time.

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY WITH LOW IDLE
SWITCH

When Monitored:

With the ignition on.

Set Condition:

The Accelerator Pedal Position Sensor Signal is below 0.20 volts, the idle

switch transitions at too high a percentage intermittently or the idle switch is not in the
correct state intermittently. NOTE: The idle switch is designed to transition when the accel
position is approximately 16% (1.00 volt). This code sets the ECM to Limp-in Mode, which
includes a fixed engine speed of 1100 RPM.

196

DRIVEABILITY - DIESEL

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY WITH POTENTI-
OMETER

When Monitored:

With the ignition on.

Set Condition:

The Accelerator Pedal Position Sensor Signal is below 0.20 volts, the idle

P2120-ACC PEDAL POSITION SENSOR 1 CKT SIGNAL VOLTAGE TOO HIGH

When Monitored:

With the ignition on.

Set Condition:

The ECM detects voltage on the Accelerator Pedal Position Sensor Signal

circuit above 4.5 volts.

P2120-ACC PEDAL POSITION SENSOR 1 CKT SIGNAL VOLTAGE TOO LOW

When Monitored:

With the ignition on.

Set Condition:

The ECM detects voltage on the Accelerator Pedal Position Sensor Signal

circuit below 0.2 volt.

P2120-ACC PEDAL POSITION SENSOR 1 CKT SUPPLY VOLTAGE TOO HIGH OR
LOW

When Monitored:

With the ignition on.

Set Condition:

The Accelerator Pedal Position Sensor 5-Volt Supply voltage is too high or

too low.

POSSIBLE CAUSES

APP SENSOR IDLE VOLTAGE

APP SENSOR WIDE OPEN THROTTLE VOLTAGE

ECM - 5-VOLT SUPPLY CIRCUIT

LOW IDLE POSITION SWITCH SENSE CIRCUIT SHORTED TO GROUND

SENSOR GROUND OPEN (APP SENSOR)

SENSOR GROUND OPEN (IDLE SWITCH)

INTERMITTENT CONDITION

5-VOLT SUPPLY CIRCUIT OPEN

APP SENSOR SIGNAL CIRCUIT OPEN

LOW IDLE POSITION SWITCH SENSE CIRCUIT OPEN

5-VOLT SUPPLY CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT

VERIFY LOW IDLE POSITION SWITCH OPERATION

APP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

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DRIVEABILITY - DIESEL

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY —

Continued

POSSIBLE CAUSES

5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

VERIFY APP SENSOR OPERATION

APP SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT

LOW IDLE POSITION SWITCH SENSE CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT

5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

ECM - SENSOR GROUND OPEN

APP SENSOR CIRCUIT SHORTED TO VOLTAGE

LOW IDLE POSITION SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE

SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

VERIFY CORRECT SWITCHING

ECM - APP SENSOR SIGNAL CIRCUIT

TEST

ACTION

APPLICABILITY

NOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs
P0641 and P0651 before diagnosing this DTC.
NOTE: The brake switch must be operational for the result of this test to be
valid.
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Connect one end of a jumper wire to the Low Idle Position Sense circuit at the APP
Sensor harness connector.
Turn the ignition on.
With the DRB, monitor the Low Idle Position Switch input while tapping the other
end of the jumper wire to the Sensor Ground circuit at the APP Sensor harness
connector.
Does the DRB change between LOW IDLE and ABOVE IDLE when tapping the
jumper wire?

All

Yes

→ Go To 2

→ Go To 20

Turn the ignition on.
With the DRB, observe the Low Idle Position Switch input.
Press and release the accelerator pedal several times while observing the DRB
display.
NOTE: The Low Idle Position Switch input should change from IDLE to
ABOVE IDLE when pressing and releasing the accelerator pedal.
Did Low Idle Position Switch input change between LOW IDLE and ABOVE IDLE?

All

Yes

→ Go To 3

→ Replace the Accelerator Pedal Position Sensor in accordance with

the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

198

DRIVEABILITY - DIESEL

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY —

Continued

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