Chrysler Town, Dodge Caravan. Manual — part 1155

TEST

ACTION

APPLICABILITY

1

NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
While observing the PRIM BRAKE SWITCH status on the DRB display, press and
release the brake pedal several times.
Does the DRB display PRIM BRAKE SWITCH: PRESSED and RELEASED for the
appropriate pedal position?

All

Yes

→ Go To 2

No

→ Go To 11

2

Turn the ignition on.
While observing the SEC BRAKE SWITCH status on the DRB display, press and
release the brake pedal several times.
Does the DRB display SEC BRAKE SWITCH: PRESSED and RELEASED for the
appropriate pedal position?

All

Yes

→ Go To 3

No

→ Go To 4

3

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.

No

→ Test Complete.

4

Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Turn the ignition on.
Measure the voltage between the Secondary Brake Switch Signal circuit and ground.
Is the voltage above 9.0 volts?

All

Yes

→ Go To 5

No

→ Go To 8

163

DRIVEABILITY - DIESEL

P0703-BRAKE SWITCH SIGNAL CIRCUITS PLAUSIBILITY WITH RE-
DUNDANT CONTACT —

Continued

TEST

ACTION

APPLICABILITY

5

Disconnect the Brake Lamp Switch harness connector.
Turn the ignition on.
While monitoring the SEC BRAKE SWITCH status with the DRB, connect a jumper
wire between ground and the Secondary Brake Switch Signal circuit.
Does the DRB display change from PRESSED to RELEASED?

All

Yes

→ Adjust or replace the Brake Lamp Switch in accordance with the

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

No

→ Go To 6

6

Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance between ground and the Secondary Brake Switch Ground
circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 7

No

→ Repair the Secondary Brake Switch Ground circuit for an open.

Perform ROAD TEST VERIFICATION - VER-2.

7

If there are no possible causes remaining, view repair.

All

Repair

Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

8

Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Secondary Brake Switch Signal
circuit.
Is the resistance above 1000 ohms?

All

Yes

→ Go To 9

No

→ Repair the Secondary Brake Switch Signal circuit for a short to

ground.
Perform ROAD TEST VERIFICATION - VER-2.

9

Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Secondary Brake Switch Signal circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 10

No

→ Repair the Secondary Brake Switch Signal circuit for an open.

Perform ROAD TEST VERIFICATION - VER-2.

10

If there are no possible causes remaining, view repair.

All

Repair

Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

164

DRIVEABILITY - DIESEL

P0703-BRAKE SWITCH SIGNAL CIRCUITS PLAUSIBILITY WITH RE-
DUNDANT CONTACT —

Continued

TEST

ACTION

APPLICABILITY

11

Disconnect the Brake Lamp Switch harness connector.
Using a 12-volt test light connected to ground, check the Fused B+ circuit.
Does the test light illuminate brightly?

All

Yes

→ Go To 12

No

→ Repair the Brake Lamp Switch Fused B+ circuit for an open.

Perform ROAD TEST VERIFICATION - VER-2.

12

Disconnect the Brake Lamp Switch harness connector.
Turn the ignition on.
While monitoring the PRIM BRAKE SWITCH status with the DRB, connect a
jumper wire between the Primary Brake Switch Signal circuit and the Fused B(+)
circuit.
Does the DRB display change from RELEASED to PRESSED?

All

Yes

→ Adjust or replace the Brake Lamp Switch in accordance with the

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

No

→ Go To 13

13

Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Remove the ECM/PCM Relay from the IPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ECM/PCM Relay
connector.
Turn the ignition on.
Measure the voltage between the Primary Brake Switch Signal circuit and ground.
Is the voltage above 1.0 volt?

All

Yes

→ Repair the Primary Brake Switch Signal circuit for a short to

voltage.
Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 14

14

Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Primary Brake Switch Signal circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Replace and program the Engine Control Module in accordance

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

No

→ Repair the Primary Brake Switch Signal circuit for an open.

Perform ROAD TEST VERIFICATION - VER-2.

165

DRIVEABILITY - DIESEL

P0703-BRAKE SWITCH SIGNAL CIRCUITS PLAUSIBILITY WITH RE-
DUNDANT CONTACT —

Continued

Symptom:

P0833-CLUTCH PEDAL PLAUSIBILITY

POSSIBLE CAUSES

CLUTCH PEDAL SWITCH

CLUTCH PEDAL SWITCH SENSE CIRCUIT OPEN

CLUTCH PEDAL SWITCH SENSE CIRCUIT SHORTED TO GROUND

ECM

INTERMITTENT CONDITION

TEST

ACTION

APPLICABILITY

1

NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Clutch switch states while pressing

and releasing the Clutch Pedal several times.
Did the DRB indicate the correct clutch pedal state when pressing and releasing the
Clutch Pedal?

All

Yes

→ Go To 2

No

→ Go To 3

2

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.
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.

No

→ Test Complete.

3

Turn the ignition off.
Disconnect the Clutch Pedal Switch harness connector.
Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Clutch Switch state while using a

jumper wire to connect the Clutch Pedal Switch Sense circuit to ground at the Clutch
Pedal Switch harness connector.
NOTE: Leave jumper connected to ground for 5 seconds then disconnect
jumper and note DRB reading for both conditions.
Does the DRB display RELEASED and PRESSED?

All

Yes

→ Replace the Clutch Pedal Switch.

Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 4

166

DRIVEABILITY - DIESEL