This diagnostic test checks for less than forty-eight pulses between CAM pulses. However, the number of 24X pulses is allowed to vary between 47 and 49, as long as any variances toggle between too few pulses, and too many pulses. If two variances do not toggle, i.e. they both had 47 reference pulses and eight 4X reference pulses were received between CAM events, then DTC P0372 is set because some 24X pulses were missed.
• | At least one CAM pulse was received in the last 0.25 seconds. |
• | Engine speed is between 496 and 1,200 RPM. |
• | Number of CAM pulses since key ON is 7 or more. |
• | Eight 4X reference pulses have been received between CAM pulses. |
• | Less than 47 24X reference pulses seen between CAM pulses. |
OR |
• | 47 24X reference pulses were received twice in a row. |
• | The PCM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
• | The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Freeze Frame and/or Failure Records. |
• | The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
• | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
• | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
• | Use a scan tool in order to clear the MIL and the DTC. |
The numbers below refer to the step numbers on the diagnostic table.
If DTC P1323 is set, diagnose it first.
Using the Freeze Frame and Failure Records can help locate an intermittent condition. Operate the vehicle within the same conditions that you observed in the Freeze Frame and Failure Records.
This step is testing for a poor connection or an intermittent open circuit which would set this DTC. Move all related ignition control and PCM harnesses in order to help isolate where the circuit condition is located.
Step | Action | Values | Yes | No |
---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
Is DTC P1323 also set? | -- | |||
Does the scan tool indicate that this diagnostic failed this ignition? | -- | Go to Diagnostic Aids | ||
Does the engine RPM displayed on the scan tool change abruptly with harness and connector movement? | -- | |||
5 |
Did you find and correct the condition? | -- | ||
6 | Repair the intermittent short to ground in the ignition control 24X signal circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
7 |
Does the scan tool indicate that this test ran and passed? | 4.2 V | ||
8 | Select the Capture Info option and the Review Info option with the scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to the applicable DTC table | System OK |