Ground Circuits

Turn ignition off. Disconnect specified PCM harness connectors. Using a DVOM, measure resistance between ground and PCM ground terminals. See POWERTRAIN CONTROL MODULE GROUND CIRCUIT TERMINALS table. Resistance should be zero ohms. If problem is found, locate and repair open suspect circuit. If no problem is found, go to next step.

POWERTRAIN CONTROL MODULE GROUND CIRCUIT TERMINALS

Vehicle & PCM Harness Connector

Terminal No.

Axiom ⁽¹⁾

E-34 (Blue)

1 & 40

E-35 (Red)

1, 23 & 40

Passport ⁽¹⁾

F (Blue)

F1 & F40

S (Red)

S1, S23 & S40

Rodeo (2.2L) & Rodeo Sport (2.2L) ⁽²⁾

C-2 (White)

C8 & C9

Rodeo (3.2L), Rodeo Sport (3.2L) & Trooper ⁽¹⁾

E-21 (Blue)

1 & 40

E-22 (Red)

1, 23 & 40

⁽¹⁾	On Axiom, Passport, Rodeo and Rodeo Sport 3.2L, PCM is located at left rear of engine compartment, near air filter housing. On Trooper, PCM is located at right rear of engine compartment.

⁽²⁾	On Rodeo and Rodeo Sport 2.2L, PCM is located under center console in front of shifter. To access PCM, see POWERTRAIN CONTROL MODULE REPLACEMENT under POWERTRAIN CONTROL MODULE in SELF-DIAGNOSTICS - RODEO & RODEO SPORT 2.2L article.

Reconnect PCM harness connectors. Using a DVOM, connect negative lead to ground and backprobe positive lead of voltmeter to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If voltmeter reading is more than specified, check ground circuit for open, short, corrosion or loose connection. If problem is found, repair as necessary.