Chrysler Town, Dodge Caravan. Manual — part 1018
Symptom:
P0888-RELAY OUTPUT ALWAYS OFF
When Monitored and Set Condition:
P0888-RELAY OUTPUT ALWAYS OFF
When Monitored:
Continuously
Set Condition:
This code is set when less than 3 volts are present at the transmission
control relay output circuits at the Transmission Control Module when the TCM is
energizing the relay.
POSSIBLE CAUSES
FUSED B+ CIRCUIT OPEN
TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN
TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN
TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND
TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND
TRANSMISSION CONTROL RELAY STUCK OPEN
TRANSMISSION CONTROL MODULE
INTERMITTENT WIRING AND CONNECTORS
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
108
TRANSMISSION - EATX
TEST
ACTION
APPLICABILITY
2
With the DRBIII
t, Check the STARTS SINCE SET counter for P0888.
Note: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter set at 0?
All
Yes
→ Go To 3
No
→ Go To 11
3
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the Fused B+ circuit in the
Transmission Control Relay connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
All
Yes
→ Go To 4
No
→ Repair the Fused B+ circuit for an open or high resistance. If the
fuse is open make sure to check for a short to ground.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
4
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Using a 12-volt test light connected to 12-volts, check the Transmission Control Relay
Ground circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
All
Yes
→ Go To 5
No
→ Repair the Transmission Control Relay Ground circuit for an open
or high resistance.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
5
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Transmission Control Relay Control circuit between
the Transmission Control Relay connector and the TCM harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Transmission Control Relay Control circuit for an
open.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 6
109
TRANSMISSION - EATX
P0888-RELAY OUTPUT ALWAYS OFF —
Continued
TEST
ACTION
APPLICABILITY
6
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Transmission Control Relay Control
circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Transmission Control Relay Control circuit for a short
to ground.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control
Relay Output circuit.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the three Transmission Control
Relay Output circuits.
NOTE: There are three Transmission Relay Output circuits. Two are located
in the TCM harness connector and one located in the Transmission
Solenoid/Pressure Switch Assembly harness connector
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly on all three Transmission Control Relay
Output circuits?
All
Yes
→ Go To 8
No
→ Repair the Transmission Control Relay Output circuit for an open
or high resistance.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
8
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Transmission Control Relay Output
circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Transmission Control Relay Output circuit for a short
to ground.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 9
110
TRANSMISSION - EATX
P0888-RELAY OUTPUT ALWAYS OFF —
Continued
TEST
ACTION
APPLICABILITY
9
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Install a substitute Relay in place of the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the DRBIII
t, actuate the Transmission Control Relay.
Using a 12-volt test light connected to ground, check the Transmission Control Relay
Output circuit in the Transmission Solenoid /Pressure Switch Assembly harness
connector.
Does the test light blink on and off?
All
Yes
→ Replace the Transmission Control Relay.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 10
10
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.
11
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 shorts 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.
111
TRANSMISSION - EATX
P0888-RELAY OUTPUT ALWAYS OFF —
Continued
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