Chrysler RG Voyager. Manual — part 1273
Symptom:
P0846-2/4 PRESSURE SWITCH SENSE CIRCUIT
When Monitored and Set Condition:
P0846-2/4 PRESSURE SWITCH SENSE CIRCUIT
When Monitored:
Whenever the engine is running.
Set Condition:
The appropriate DTC is set if one of the Pressure Switches are open or
closed at the wrong time in a given gear .
POSSIBLE CAUSES
TRANSMISSION CONTROL RELAY DTC’S PRESENT
TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
2/4 PRESSURE SWITCH SENSE CIRCUIT OPEN
2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
2/4 PRESSURE SWITCH
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 Service Bulletins related to the symptom.
Perform this procedure prior to Symptom diagnosis.
All
Continue
93
TRANSMISSION - EATX
TEST
ACTION
APPLICABILITY
2
With the DRBIII
t, read Transmission DTC’s
Are there any Transmission Control Relay related DTC’s present?
All
Yes
→ Refer to the Transmission category and perform the appropriate
symptom.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 3
3
With the DRBIII
t, Check the STARTS SINCE SET counter.
NOTE: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter 2 or less for P0846?
All
Yes
→ Go To 4
No
→ Go To 11
4
Turn the ignition off to the lock position.
Remove the Starter Relay.
CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO
RESPONSE, condition and disable the starter.
Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmis-
sion Adapter kit 8333-1A.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the Transmission Simulator, select 2/4 on the Pressure Switch selector switch.
With the DRBIII
t, monitor the 2/4 Pressure Switch state while pressing the Pressure
Switch Test button on the Transmission Simulator.
Did the Pressure Switch state change from OPEN to CLOSED when the test button
was pressed?
All
Yes
→ Go To 5
No
→ Go To 6
5
If there are no possible causes remaining, view repair.
All
Repair
Replace Transmission Solenoid/Pressure Switch Assembly per the
Service Information.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
6
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the 2/4 Pressure Switch Sense circuit from the TCM
harness connector to the Transmission Solenoid/Pressure Switch Assembly harness
connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the 2/4 Pressure Switch Sense circuit for an open.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 7
94
TRANSMISSION - EATX
P0846-2/4 PRESSURE SWITCH SENSE CIRCUIT —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the 2/4 Pressure Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the 2/4 Pressure Switch Sense circuit for a short to ground.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 8
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.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control
Relay Output circuit in the Transmission Control Relay connector.
Ignition on, engine not running.
Measure the voltage of the 2/4 Pressure Switch Sense circuit.
Is the voltage above 0.5 volt?
All
Yes
→ Repair the 2/4 Pressure Switch Sense circuit for a short to voltage.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 9
9
Turn the ignition off to the lock position.
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 in the Transmission Control Relay connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the Transmission Control Relay
Output 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 10
No
→ Repair the Transmission Control Relay Output circuit for an
open.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
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.
95
TRANSMISSION - EATX
P0846-2/4 PRESSURE SWITCH SENSE CIRCUIT —
Continued
TEST
ACTION
APPLICABILITY
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 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.
96
TRANSMISSION - EATX
P0846-2/4 PRESSURE SWITCH SENSE CIRCUIT —
Continued
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