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 MANUALSCHEVROLET2001EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRREPAIR INSTRUCTIONSALTERNATIVE FUELS ENGINE CONTROL MODULE (AF ECM) REPLACEMENT
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Alternative Fuels Engine Control Module (AF ECM) Replacement
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Alternative Fuels Engine Control Module (AF ECM) Replacement
REMOVAL PROCEDURE
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the bolt from the coolant recovery reservoir.
3. Set aside the coolant recovery reservoir.
4. Press down the release tab on the Alternative Fuels ECM mounting bracket (5) and lift the ECM (7) from the bracket.
5. Remove the connector position assurance locks (3) and disconnect the electrical connectors (2, 4) from the ECM(1).
If mounting bracket removal is not necessary proceed to Installation Procedure Step 6.
6. Remove the ECM mounting bracket (5) bolts (6) from the ECM adapter bracket (4).
7. Remove the ECM mounting bracket.
8. Remove the right turn signal lens.
9. Loosen the front ECM adapter bracket bolt (9) located behind the right turn signal lens.
10. Remove the fender support rod to ECM adapter bracket bolt (3).
11. Remove the fender support rod bolt (2) and the support rod (1).
12. Remove the rear ECM adapter bracket bolt (8).
13. Remove the ECM adapter bracket (4) from the vehicle.
INSTALLATION PROCEDURE
1. Install the ECM adapter bracket into the vehicle ensuring that the bracket is placed on the loosened forward bolt (9).
2. Install the rear ECM adapter bracket bolt (8).
3. Install the fender support rod (1) and bolt (2)
NOTE: Refer to Fastener Notice in Service Precautions.
4. Install the fender support rod to ECM adapter bracket bolt (3).
Tighten
Tighten the front ECM adapter bracket bolt (9) to 24 N.m (18 lb ft).
Tighten
Tighten the rear ECM adapter bracket bolt (8) to 24 N.m (18 lb ft).
Tighten
Tighten the support rod bolt (2) at the fender to 24 N.m (18 lb ft).
Tighten
Tighten the support rod bolt (3) at the adapter bracket to 12 N.m (108 lb in).
5. Install the ECM mounting bracket (5) to the ECM adapter bracket (4) using the four bolts (6).
Tighten
Tighten the four mounting bolts to 12 N.m (106 lb in).
6. Connect the electrical connectors (2, 4) to the Alternative Fuels ECM (1) and install the connector position assurance locks (3).
7. Press the Alternative Fuels ECM into the mounting bracket.
8. Position the coolant recovery reservoir and install the mounting bolt.
Tighten
Tighten the bolt to 11 N.m (97 lb in).
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
9. Install the negative battery cable.
10. Program the ECM with the correct Alternative Fuels software if necessary.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the bolt from the coolant recovery reservoir.
3. Set aside the coolant recovery reservoir.
4. Press down the release tab on the Alternative Fuels ECM mounting bracket (5) and lift the ECM (7) from the bracket.
5. Remove the connector position assurance locks (3) and disconnect the electrical connectors (2, 4) from the ECM(1).
If mounting bracket removal is not necessary proceed to Installation Procedure Step 6.
6. Remove the ECM mounting bracket (5) bolts (6) from the ECM adapter bracket (4).
7. Remove the ECM mounting bracket.
8. Remove the right turn signal lens.
9. Loosen the front ECM adapter bracket bolt (9) located behind the right turn signal lens.
10. Remove the fender support rod to ECM adapter bracket bolt (3).
11. Remove the fender support rod bolt (2) and the support rod (1).
12. Remove the rear ECM adapter bracket bolt (8).
13. Remove the ECM adapter bracket (4) from the vehicle.
INSTALLATION PROCEDURE
1. Install the ECM adapter bracket into the vehicle ensuring that the bracket is placed on the loosened forward bolt (9).
2. Install the rear ECM adapter bracket bolt (8).
3. Install the fender support rod (1) and bolt (2)
NOTE: Refer to Fastener Notice in Service Precautions.
4. Install the fender support rod to ECM adapter bracket bolt (3).
Tighten
Tighten the front ECM adapter bracket bolt (9) to 24 N.m (18 lb ft).
Tighten
Tighten the rear ECM adapter bracket bolt (8) to 24 N.m (18 lb ft).
Tighten
Tighten the support rod bolt (2) at the fender to 24 N.m (18 lb ft).
Tighten
Tighten the support rod bolt (3) at the adapter bracket to 12 N.m (108 lb in).
5. Install the ECM mounting bracket (5) to the ECM adapter bracket (4) using the four bolts (6).
Tighten
Tighten the four mounting bolts to 12 N.m (106 lb in).
6. Connect the electrical connectors (2, 4) to the Alternative Fuels ECM (1) and install the connector position assurance locks (3).
7. Press the Alternative Fuels ECM into the mounting bracket.
8. Position the coolant recovery reservoir and install the mounting bolt.
Tighten
Tighten the bolt to 11 N.m (97 lb in).
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
9. Install the negative battery cable.
10. Program the ECM with the correct Alternative Fuels software if necessary.
RENDER: 1.0x
NO RELATED
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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.