Chrysler Voyager. Manual — part 472

Symptom:

P0891-TRANSMISSION RELAY ALWAYS ON

When Monitored and Set Condition:

P0891-TRANSMISSION RELAY ALWAYS ON

When Monitored:

When the ignition is turned from the OFF position to the RUN position

and/or the ignition is turned from the CRANK position to RUN position.

Set Condition:

This DTC is set if the Transmission Control Module senses greater than

3.0 volts at the Transmission Control Relay Output terminal of the TCM prior to the TCM
energizing the Transmission Control Relay.

POSSIBLE CAUSES

INTERMITTENT WIRING AND CONNECTORS

TRANSMISSION CONTROL RELAY STUCK CLOSED

TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE

TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO VOLTAGE

TRANSMISSION CONTROL MODULE

TEST

ACTION

APPLICABILITY

1

NOTE: Low fluid level can be the cause of many Transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII

t, read the engine DTC’s. Check and repair all engine DTC’s prior

to performing Transmission Symptom Diagnostics.
With the DRBIII

t, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures.

NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0706 Check Shifter Signal.
For Gear Ratio DTC’s, check and record all CVI’s.
Most DTC’s set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB’s related to the symptom.
Perform this procedure prior to Symptom diagnosis.

All

Continue

Go To

2

115

TRANSMISSION - EATX

TEST

ACTION

APPLICABILITY

2

With the DRBIII

t, check the STARTS SINCE SET counter for P0891.

Note: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter set to 0?

All

Yes

→ Go To 3

No

→ Go To 7

3

Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Fused B+ circuit and the Transmission Control
Relay Output Circuit in the Transmission Control Relay.
Is the resistance above 5.0 ohms?

All

Yes

→ Go To 4

No

→ Replace the Transmission Control Relay.

Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

4

Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Solenoid/Pressure Switch Assembly harness connector.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Measure the voltage of the Transmission Control Relay Output circuit in the
Solenoid/Pressure Switch Assembly harness connector.
Is the voltage above 0.5 volt?

All

Yes

→ Repair the Transmission Control Relay Output circuit for a short

to voltage
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Go To 5

5

Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Ignition on, engine not running.
Note: Check connectors - Clean/repair as necessary.
Measure the voltage of the Transmission Control Relay Control circuit.
Is the voltage above 0.5 volt?

All

Yes

→ Repair Transmission Relay Control Circuit for a short to voltage.

Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Go To 6

6

Using the schematics as a guide, inspect the wiring and connectors. Repair as
necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.

All

Repair

Replace the Transmission Control Module per the Service Infor-
mation. WITH THE DRBIII

t PERFORM QUICK LEARN AND

REPROGRAM PINION FACTOR.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

116

TRANSMISSION - EATX

P0891-TRANSMISSION RELAY ALWAYS ON —

Continued

TEST

ACTION

APPLICABILITY

7

The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorted and open circuits.
With the DRBIII

t, check the EATX EVENT DATA to help identify the conditions in

which the DTC was set.
Were there any problems found?

All

Yes

→ Repair as necessary.

Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Test Complete.

117

TRANSMISSION - EATX

P0891-TRANSMISSION RELAY ALWAYS ON —

Continued

Symptom:

P0897-WORN OUT/BURNT TRANSAXLE FLUID

When Monitored and Set Condition:

P0897-WORN OUT/BURNT TRANSAXLE FLUID

When Monitored:

With each transition from full Torque Convertor to partial Torque

Convertor engagement for A/C bump prevention.

Set Condition:

When vehicle shudder is detected during partial engagement (PEMCC).

POSSIBLE CAUSES

WORN OUT/ BURNT TRANSMISSION FLUID

TEST

ACTION

APPLICABILITY

1

NOTE: Low fluid level can be the cause of many Transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII

t, read the engine DTC’s. Check and repair all engine DTC’s prior

to performing Transmission Symptom Diagnostics.
With the DRBIII

t, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures.

NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0706 Check Shifter Signal.
For Gear Ratio DTC’s, check and record all CVI’s.
Most DTC’s set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB’s related to the symptom.
Perform this procedure prior to Symptom diagnosis.

All

Continue

Go To

2

118

TRANSMISSION - EATX