Engine Controls - Revised DTC P0336
Bulletin No.: 03-06-04-033ADate: February 26, 2004
SERVICE MANUAL UPDATE
Subject:
Revised DTC P0336
Models:
2004 Buick Rainier
2003 Cadillac Escalade, Escalade ESV, Escalade EXT
2003-2004 Chevrolet Astro, Blazer, Express, Kodiak, S-10, TrailBlazer, TrailBlazer EXT
2003 Chevrolet Avalanche, Silverado, Silverado HD, Suburban, Tahoe
2003 GMC Sierra, Sierra HD, Sierra Denali, TopKick, Yukon, Yukon Denali, Yukon XL
2003-2004 GMC Envoy, Envoy XL, Jimmy, Safari, Savana, Sonoma
2004 GMC Envoy XUV
2003-2004 HUMMER H2
2003-2004 Isuzu Ascender, NPR/NQR Commercial Models
with 4.3L, 4.8L, 5.3L, 6.0L or 8.1L Engine (VINs X, V, P, T, Z, U, N, G - RPOs LU3, LR4, LM4, LM7, L59, LQ4, LQ9, L18)
Supercede:
This bulletin is being revised to correct the information. Please discard Corporate Bulletin Number 03-06-04-033 (Section 06 - Engine/Propulsion System).
n�^:
This bulletin is being issued to revise DTC P0336 in the Engine Controls sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information. The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Circuit Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor circuits are connected directly to the powertrain control module (PCM) and consists of the following circuits:
^ The 12-volt reference circuit
^ The low reference circuit
^ The CKP sensor signal circuit
If the PCM detects that the CKP sensor signal is inconsistent for 2 seconds, DTC P0336 sets.
Conditions for Running the DTC
The engine is cranking or running.
Conditions for Setting the DTC
The PCM detects that the CKP sensor signal is inconsistent for 2 seconds.
Action Taken When the DTC Sets
^ The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
^ The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
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