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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 52 (ENGINE CONTROLS SELF-DIAGNOSTICS - 6.5L)DIAGNOSTIC TESTSDTC P0370: TIMING REFERENCE HIGH RESOLUTIONDIAGNOSTIC AIDS
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F

Diagnostic Aids

2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Intermittent DTCs P0251, P0370 and P1216 may be caused by air entering the fuel system when fuel levels get below 1/8 of a tank while performing hard acceleration or turning maneuvers. DTC P0251, P0370 and P1216 may set if the vehicle has run out of fuel. Customer driving habits should be checked to determine if vehicle has been performing in these manners. If the vehicle has been performing under these conditions, bleed fuel system of all air and test drive vehicle.

When the PCM is in backup fuel, fast idle and poor performance problems will exist. If DTC P0251 is also stored, the Snapshot mode on the scan tool should be used to in order to properly identify a malfunction. DTC P0335, P1216, and P1217 may set along with this DTC.

The least likely cause of failure is the PCM.

RPM VS HERTZ FOR HIGH RESOLUTION SIGNAL

RPM Hertz
700 2987
800 3413
900 3840
1000 4267
1100 4693
1200 5120
1300 5547
1400 5973
1500 6400
1600 6827
1700 7253
1800 7680
1900 8170
2000 8533
2100 8960
2200 9387
2300 9813
2400 10,240
2500 10,667
2600 11,093
2700 11,520
2800 11,947
2900 12,373
3000 12,800
3100 13,227
3200 13,653
3300 14,080
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.