Chrysler Town, Dodge Caravan. Manual - part 995

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Using a 12-volt test light connected to ground, probe the Fused B(+) circuit in the
appropriate terminal of special tool #8815.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Is the test light illuminated?

All

Yes

→ Go To 4

→ Repair the Fused B(+) circuit for an open. Refer to the wiring

diagrams located in the Service Information.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.

Turn the ignition off.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Using a 12-volt test light connected to 12-volts, probe each ground circuit in the
appropriate terminal of special tool #8815.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Is the light illuminated at all ground circuits?

All

Yes

→ Go To 5

→ Repair the Ground circuit(s) for an open. Check the main ground

connection to engine block and/or chassis. Refer to the wiring
diagrams located in the Service Information.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.

COMMUNICATION

*NO RESPONSE FROM TRANSMISSION CONTROL MODULE - NGC —

Continued

TEST

ACTION

APPLICABILITY

Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII

t select Pep Module Tools.

Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Set Probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the appropriate terminal of special tool #8815.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?

All

Yes

→ Go To 6

→ Repair the PCI Bus circuit for an open.

Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.

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 and program the Powertrain Control Module in accor-
dance with the service information. WITH THE DRBIII

t PER-

FORM QUICK LEARN AND REPROGRAM PINION FACTOR.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.

COMMUNICATION

*NO RESPONSE FROM TRANSMISSION CONTROL MODULE - NGC —

Continued

Symptom:

P0122-TPS/APPS LOW

When Monitored and Set Condition:

P0122-TPS/APPS LOW

When Monitored:

Continuously with the ignition on and engine running.

Set Condition:

This DTC will set if the monitored TPS voltage drops below .078 volts for

the period of 0.48 seconds.

POSSIBLE CAUSES

ENGINE TPS DTC’S PRESENT

TPS SIGNAL CIRCUIT HIGH RESISTANCE

TRANSMISSION CONTROL MODULE

INTERMITTENT WIRING AND CONNECTORS

TEST

ACTION

APPLICABILITY

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

With the DRBIII

t, check Engine DTC’s.

Are there any Engine TPS related DTCs present?

All

Yes

→ Refer to the Powertrain category and perform the appropriate

symptom.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

→ Go To 3

TRANSMISSION - EATX

TEST

ACTION

APPLICABILITY

With the DRBIII

t in Transmission Sensors, read the TPS voltage.

Is the TPS voltage below 0.5 volts?

All

Yes

→ Go To 4

→ Go To 6

Ignition on, engine not running.
With the DRBIII

t in Transmission Sensors, record the TPS voltage.

While back probing the TCM harness connector, measure the voltage of the TPS
Signal circuit.
Compare the voltage readings between the DRBIII

t and the reading from the digital

multi meter.
Are the voltages within 0.1 volt of each other?

All

Yes

→ Repair the TPS signal circuit between the TCM harness connector

and the splice for high resistance.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

→ Go To 5

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.

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 wires while checking for shorted and open circuits.
Pay particular attention to the point where the TPS signal and sensor ground circuits
splice off from the engine 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.

→ Test Complete.

TRANSMISSION - EATX

P0122-TPS/APPS LOW —

Continued

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