Dodge ZB 2005 Service Manual page 1179

DRIVEABILITY - GAS
P0131-O2 SENSOR 1/1 CIRCUIT VOLTAGE TOO LOW —
TEST
5 NOTE: Two types of O2 Sensor Heater Ground circuits may be used on this
vehicle. One type uses an engine ground and the other type uses the PCM as
a ground through the Pulse Width Modulated circuit.
* Measure the resistance between the PWM O2 Sensor Heater Control circuit and the
O2 Sensor Signal circuit if it applies to the O2 Sensor being tested.
OR
* Measure the resistance between the O2 Sensor Signal circuit and the (Z1) O2
Sensor Heater ground circuit if it applies to the O2 Sensor being tested.
Is the resistance below 100 ohms?
Yes → Repair the short between the O2 Sensor Signal circuit and the
→ Go To 6
No
6 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
Repair
ACTION
Heater ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
58
Continued
APPLICABILITY
All
All