Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP2009COMPASS 4WD L4-2.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSBY SYMPTOMRECALLSRECALL - PCM REPLACEMENT/SOFTWARE UPDATESERVICE PROCEDUREB. PCM REPLACEMENT FOR JS/JC MODELS
2009 Jeep Compass 4WD L4-2.0L
B. PCM Replacement For JS/JC Models
2009 Jeep Compass 4WD L4-2.0LSECTION B. PCM Replacement For JS/JC Models
1. Open the hood. Install a battery charger and verify that the charging rate provides 13.0 to 13.5 volts. Do not allow the charger to time out during the flash process. Set the battery charger timer (if so equipped) to continuous charge.
NOTE:
Use an accurate stand alone voltmeter. The battery charger voltmeter may not be sufficiently accurate. Voltages outside of the specified range will cause an unsuccessful flash. If voltage reading is too high, apply an electrical load by activating the park or headlamps and/or HVAC blower motor to lower the voltage.
2. Determine the PCM software part number using the following procedure:
Using StarSCAN:
a. Connect the CH9404 StarSCAN vehicle cable to the StarSCAN and the vehicle.
b. Place the Ignition in the "RUN" position, then Power "ON" the StarSCAN.
c. Starting at the "Home" screen select "ECU View".
d. Touch the screen to highlight "PCM" in the list of modules.
e. Select "More Options".
f. Select "ECU Flash".
g. Record the part number at the top of the Flash PCM screen for later reference.
Using StarMOBILE:
a. Connect the CH9410 StarMOBILE ethernet cable to the StarMOBILE and the dealer's network drop.
b. Connect the CH9404 StarMOBILE vehicle cable to the StarMOBILE and the vehicle.
c. Place the Ignition in the "RUN" position, then Power "ON" the StarMOBILE.
d. Record the StarMOBILE I.P. address displayed on the StarMOBILE screen.
e. From the desktop, launch the "StarMOBILE Desktop Client" software.
f. Establish a connection with the StarMOBILE scan tool.
g. Starting at the "Home" screen select "ECU View".
h. Touch the screen to highlight "PCM" in the list of modules.
i. Select "More Options".
j. Select "ECU Flash".
k. Record the part number at the top of the Flash PCM screen for later reference.
3. Place the Ignition in the "OFF" position.
4. Disconnect and remove the battery charger.
5. Disconnect the negative battery cable.
6. Disconnect both PCM electrical connectors (Figure 2).
7. Remove the two PCM mounting bracket retaining nuts and remove the PCM and mounting bracket as an assembly (Figure 2).
8. Remove the four mounting screws that hold the PCM to the mounting bracket.
9. Install the new PCM on to the mounting bracket.
10. Install the four PCM-to-mounting bracket retaining screws. Tighten the screws to 95 lbs. in. (11 N.m) (Figure 2).
11. Install the PCM and bracket into the vehicle. Tighten the two mounting nuts to 95 in. lbs. (11 N.m).
12. Connect both PCM electrical connectors (Figure 2).
13. Connect the negative battery cable.
14. Continue with Section C. Program PCM.
NOTE:
Use an accurate stand alone voltmeter. The battery charger voltmeter may not be sufficiently accurate. Voltages outside of the specified range will cause an unsuccessful flash. If voltage reading is too high, apply an electrical load by activating the park or headlamps and/or HVAC blower motor to lower the voltage.
2. Determine the PCM software part number using the following procedure:
Using StarSCAN:
a. Connect the CH9404 StarSCAN vehicle cable to the StarSCAN and the vehicle.
b. Place the Ignition in the "RUN" position, then Power "ON" the StarSCAN.
c. Starting at the "Home" screen select "ECU View".
d. Touch the screen to highlight "PCM" in the list of modules.
e. Select "More Options".
f. Select "ECU Flash".
g. Record the part number at the top of the Flash PCM screen for later reference.
Using StarMOBILE:
a. Connect the CH9410 StarMOBILE ethernet cable to the StarMOBILE and the dealer's network drop.
b. Connect the CH9404 StarMOBILE vehicle cable to the StarMOBILE and the vehicle.
c. Place the Ignition in the "RUN" position, then Power "ON" the StarMOBILE.
d. Record the StarMOBILE I.P. address displayed on the StarMOBILE screen.
e. From the desktop, launch the "StarMOBILE Desktop Client" software.
f. Establish a connection with the StarMOBILE scan tool.
g. Starting at the "Home" screen select "ECU View".
h. Touch the screen to highlight "PCM" in the list of modules.
i. Select "More Options".
j. Select "ECU Flash".
k. Record the part number at the top of the Flash PCM screen for later reference.
3. Place the Ignition in the "OFF" position.
4. Disconnect and remove the battery charger.
5. Disconnect the negative battery cable.
6. Disconnect both PCM electrical connectors (Figure 2).
7. Remove the two PCM mounting bracket retaining nuts and remove the PCM and mounting bracket as an assembly (Figure 2).
8. Remove the four mounting screws that hold the PCM to the mounting bracket.
9. Install the new PCM on to the mounting bracket.
10. Install the four PCM-to-mounting bracket retaining screws. Tighten the screws to 95 lbs. in. (11 N.m) (Figure 2).
11. Install the PCM and bracket into the vehicle. Tighten the two mounting nuts to 95 in. lbs. (11 N.m).
12. Connect both PCM electrical connectors (Figure 2).
13. Connect the negative battery cable.
14. Continue with Section C. Program PCM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.