Chrysler Town, Dodge Caravan. Manual — part 1125

Symptom:

P0190-FUEL PRESS SENSOR CIRCUIT MALF SUPPLY VOLTAGE
TOO HIGH OR LOW

When Monitored and Set Condition:

P0190-FUEL PRESS SENSOR CIRCUIT MALF SUPPLY VOLTAGE TOO HIGH OR
LOW

When Monitored:

With the ignition on.

Set Condition:

The Fuel Pressure Sensor 5-Volt Supply voltage is below 4.7 volts or above

5.1 volts for 100 ms.

POSSIBLE CAUSES

CHECK FOR SENSOR REFERENCE VOLTAGE A CIRCUIT DTCS

ENGINE CONTROL MODULE

TEST

ACTION

APPLICABILITY

1

WARNING: THE FUEL INJECTION PUMP SUPPLIES HIGH-PRESSURE
FUEL TO EACH INDIVIDUAL INJECTOR THROUGH HIGH-PRESSURE
FUEL LINES. FUEL UNDER HIGH PRESSURE CAN PENETRATE SKIN
AND CAUSE PERSONAL INJURY. WEAR SAFETY GOGGLES AND ADE-
QUATE PROTECTIVE CLOTHING.
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 DRB, read ECM DTCs.
Is the High or Low DTC for P0641 SENSOR REFERENCE VOLTAGE A CIRCUIT
set with this DTC?

All

Yes

→ Refer to the symptom list for the related symptom(s).

Perform ROAD TEST VERIFICATION - VER-2.

No

→ Replace and program the Engine Control Module in accordance

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

43

DRIVEABILITY - DIESEL

Symptom List:

P0201-CYLINDER 1-INJECTOR CIRCUIT CURRENT DECREASE
P0201-CYLINDER 1-INJECTOR CIRCUIT LOAD DROP
P0201-CYLINDER 1-INJECTOR CIRCUIT OVERCURRENT HIGH
SIDE
P0201-CYLINDER 1-INJECTOR CIRCUIT OVERCURRENT LOW
SIDE
P0202-CYLINDER 2-INJECTOR CIRCUIT CURRENT DECREASE
P0202-CYLINDER 2-INJECTOR CIRCUIT LOAD DROP
P0202-CYLINDER 2-INJECTOR CIRCUIT OVERCURRENT HIGH
SIDE
P0202-CYLINDER 2-INJECTOR CIRCUIT OVERCURRENT LOW
SIDE
P0203-CYLINDER 3-INJECTOR CIRCUIT CURRENT DECREASE
P0203-CYLINDER 3-INJECTOR CIRCUIT LOAD DROP
P0203-CYLINDER 3-INJECTOR CIRCUIT OVERCURRENT HIGH
SIDE
P0203-CYLINDER 3-INJECTOR CIRCUIT OVERCURRENT LOW
SIDE
P0204-CYLINDER 4-INJECTOR CIRCUIT CURRENT DECREASE
P0204-CYLINDER 4-INJECTOR CIRCUIT LOAD DROP
P0204-CYLINDER 4-INJECTOR CIRCUIT OVERCURRENT HIGH
SIDE
P0204-CYLINDER 4-INJECTOR CIRCUIT OVERCURRENT LOW
SIDE

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P0201-CYLINDER 1-INJECTOR
CIRCUIT CURRENT DECREASE.

When Monitored and Set Condition:

P0201-CYLINDER 1-INJECTOR CIRCUIT CURRENT DECREASE

When Monitored:

With the engine running.

Set Condition:

The ECM detects an incorrect rate of current decrease after injection

occurs.

P0201-CYLINDER 1-INJECTOR CIRCUIT LOAD DROP

When Monitored:

With the engine running.

Set Condition:

The ECM detects insufficient current through the injector driver when on.

44

DRIVEABILITY - DIESEL

P0201-CYLINDER 1-INJECTOR CIRCUIT OVERCURRENT HIGH SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the common driver circuit.

P0201-CYLINDER 1-INJECTOR CIRCUIT OVERCURRENT LOW SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the injector driver circuit.

P0202-CYLINDER 2-INJECTOR CIRCUIT CURRENT DECREASE

When Monitored:

With the engine running.

Set Condition:

The ECM detects an incorrect rate of current decrease after injection

occurs.

P0202-CYLINDER 2-INJECTOR CIRCUIT LOAD DROP

When Monitored:

With the engine running.

Set Condition:

The ECM detects insufficient current through the injector driver when on.

P0202-CYLINDER 2-INJECTOR CIRCUIT OVERCURRENT HIGH SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the common driver circuit.

P0202-CYLINDER 2-INJECTOR CIRCUIT OVERCURRENT LOW SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the injector driver circuit.

P0203-CYLINDER 3-INJECTOR CIRCUIT CURRENT DECREASE

When Monitored:

With the engine running.

Set Condition:

The ECM detects an incorrect rate of current decrease after injection

occurs.

P0203-CYLINDER 3-INJECTOR CIRCUIT LOAD DROP

When Monitored:

With the engine running.

Set Condition:

The ECM detects insufficient current through the injector driver when on.

P0203-CYLINDER 3-INJECTOR CIRCUIT OVERCURRENT HIGH SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the common driver circuit.

P0203-CYLINDER 3-INJECTOR CIRCUIT OVERCURRENT LOW SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the injector driver circuit.

45

DRIVEABILITY - DIESEL

P0201-CYLINDER 1-INJECTOR CIRCUIT CURRENT DECREASE —

Continued

P0204-CYLINDER 4-INJECTOR CIRCUIT CURRENT DECREASE

When Monitored:

With the engine running.

Set Condition:

The ECM detects an incorrect rate of current decrease after injection

occurs.

P0204-CYLINDER 4-INJECTOR CIRCUIT LOAD DROP

When Monitored:

With the engine running.

Set Condition:

The ECM detects insufficient current through the injector driver when on.

P0204-CYLINDER 4-INJECTOR CIRCUIT OVERCURRENT HIGH SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the common driver circuit.

P0204-CYLINDER 4-INJECTOR CIRCUIT OVERCURRENT LOW SIDE

When Monitored:

With the engine running.

Set Condition:

The ECM detects excessive current on the injector driver circuit.

POSSIBLE CAUSES

ENGINE CONTROL MODULE

INTERMITTENT CONDITION

FUEL INJECTOR CONTROL CIRCUIT SHORTED TO VOLTAGE

COMMON DRIVER CIRCUIT SHORTED TO VOLTAGE

FUEL INJECTOR CONTROL CIRCUIT SHORTED TO GROUND

COMMON DRIVER CIRCUIT SHORTED TO GROUND

FUEL INJECTOR CIRCUITS SHORTED TOGETHER

FUEL INJECTOR CONTROL CIRCUIT OPEN

COMMON DRIVER CIRCUIT OPEN

FUEL INJECTOR

46

DRIVEABILITY - DIESEL

P0201-CYLINDER 1-INJECTOR CIRCUIT CURRENT DECREASE —

Continued