DTC 1336 wont clear
12-01-2007, 11:11 PM
#1
DTC 1336 wont clear I know its the code for crank sensor, and did a search. Here is the deal, a friend swapped a 6.0 into a trans am and it flagged 1336. I went to do the crank re-learn with efi live and everything seemed to work. Start the car back up and the code is still there. The code wont clear, I can just have the key turned on and clear it and it will come back instantly. We changed the crank sensor and it still doesnt clear. Any one have any ideas?
12-02-2007, 04:54 AM
#2
here's some copy \ paste on 1336.
DTC P1336: CKP SYSTEM VARIATION NOT LEARNED ("F" BODY) Circuit Description The Crankshaft Position (CKP) sensor sends pulses to PCM as the reluctor teeth rotate past the CKP sensor. PCM uses the CKP pulses to synchronize ignition and fuel injector operation, and to time interval between each CKP pulse. PCM determines when an excessive change in crankshaft speed occurs by comparing each new time interval with previous interval. A misfire causes an unexpected change in crankshaft speed. A certain amount of acceleration/deceleration is expected between each firing stroke, but if crankshaft speed changes more than expected amount, PCM interprets this as a misfire. Interval between CKP sensor pulses is extremely small. At high engine speeds, slight variations in the crankshaft, reluctor and CKP sensor components make misfire detection difficult. PCM learns variations during CKP system variation learning procedure. PCM compensates for these variations when performing detect misfire calculations. Only a scan tool can command PCM to perform CKP system variation learning procedure again. Perform learning procedure after the following actions: PCM replacement. Any operation or repair involving crankshaft, CKP sensor or CKP sensor-to-reluctor wheel gap relationship. Engine replacement. Ignition switch left in ON position until battery is drained. Reprogramming PCM does not require running the CKP system variation learn procedure unless PCM is new or from another vehicle. Conditions for setting DTC are: no CKP or CMP sensor DTCs present and PCM has not learned the CKP system variation. Diagnostic Procedures 1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step. 2. Perform CKP Variation Learning procedure as follows: Install scan tool. Apply parking brakes and block drive wheels. Close hood. Place transmission in Park (A/T) or Neutral (M/T). NOTE: For circuit reference, see WIRING DIAGRAMS article. NOTE: Removing power to PCM with ignition on may clear/erase stored pulse value and set this DTC.
Warm engine to 150°F (65°C). Turn off all accessories. Apply service brakes for duration of procedure. Enable CKP SYSTEM VARIATION LEARN PROC on scan tool. Slowly raise engine speed to 4000 RPM. Immediately release throttle when engine speed decreases. If scan tool shows CKP learn procedure is complete, go to step 5 . If scan tool does not show CKP learn procedure is complete, go to next step. 3. Attempt CKP learn procedure as many as 3 times. If scan tool indicates that learn procedure is complete, go to step 5 . If scan tool does not indicate that learn procedure is complete, go to next step. 4. Check CKP sensor and crankshaft reluctor wheel for damage. If problem is found, go to step 6 . If no problem is found, see DIAGNOSTIC AIDS . 5. Turn ignition off for 15 seconds, then go to step 7 . 6. Replace CKP sensor and/or reluctor wheel. After replacing components, go to next step. 7. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2 . 8. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test. Diagnostic Aids If CKP learn procedure cannot be learned, check for a chipped or damaged reluctor wheel, incorrect CKP sensor alignment to reluctor wheel, excessive crankshaft runout, interference in signal circuit to CKP sensor or incorrect ratio of crankshaft to camshaft pulses. If PCM receives an incorrect crankshaft to camshaft ratio, PCM will not allow scan tool to enable the learn procedure.
DTC P1336: CKP SYSTEM VARIATION NOT LEARNED ("F" BODY) Circuit Description The Crankshaft Position (CKP) sensor sends pulses to PCM as the reluctor teeth rotate past the CKP sensor. PCM uses the CKP pulses to synchronize ignition and fuel injector operation, and to time interval between each CKP pulse. PCM determines when an excessive change in crankshaft speed occurs by comparing each new time interval with previous interval. A misfire causes an unexpected change in crankshaft speed. A certain amount of acceleration/deceleration is expected between each firing stroke, but if crankshaft speed changes more than expected amount, PCM interprets this as a misfire. Interval between CKP sensor pulses is extremely small. At high engine speeds, slight variations in the crankshaft, reluctor and CKP sensor components make misfire detection difficult. PCM learns variations during CKP system variation learning procedure. PCM compensates for these variations when performing detect misfire calculations. Only a scan tool can command PCM to perform CKP system variation learning procedure again. Perform learning procedure after the following actions: PCM replacement. Any operation or repair involving crankshaft, CKP sensor or CKP sensor-to-reluctor wheel gap relationship. Engine replacement. Ignition switch left in ON position until battery is drained. Reprogramming PCM does not require running the CKP system variation learn procedure unless PCM is new or from another vehicle. Conditions for setting DTC are: no CKP or CMP sensor DTCs present and PCM has not learned the CKP system variation. Diagnostic Procedures 1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step. 2. Perform CKP Variation Learning procedure as follows: Install scan tool. Apply parking brakes and block drive wheels. Close hood. Place transmission in Park (A/T) or Neutral (M/T). NOTE: For circuit reference, see WIRING DIAGRAMS article. NOTE: Removing power to PCM with ignition on may clear/erase stored pulse value and set this DTC.
Warm engine to 150°F (65°C). Turn off all accessories. Apply service brakes for duration of procedure. Enable CKP SYSTEM VARIATION LEARN PROC on scan tool. Slowly raise engine speed to 4000 RPM. Immediately release throttle when engine speed decreases. If scan tool shows CKP learn procedure is complete, go to step 5 . If scan tool does not show CKP learn procedure is complete, go to next step. 3. Attempt CKP learn procedure as many as 3 times. If scan tool indicates that learn procedure is complete, go to step 5 . If scan tool does not indicate that learn procedure is complete, go to next step. 4. Check CKP sensor and crankshaft reluctor wheel for damage. If problem is found, go to step 6 . If no problem is found, see DIAGNOSTIC AIDS . 5. Turn ignition off for 15 seconds, then go to step 7 . 6. Replace CKP sensor and/or reluctor wheel. After replacing components, go to next step. 7. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2 . 8. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test. Diagnostic Aids If CKP learn procedure cannot be learned, check for a chipped or damaged reluctor wheel, incorrect CKP sensor alignment to reluctor wheel, excessive crankshaft runout, interference in signal circuit to CKP sensor or incorrect ratio of crankshaft to camshaft pulses. If PCM receives an incorrect crankshaft to camshaft ratio, PCM will not allow scan tool to enable the learn procedure.
