6.0 question
Thread Starter
|
Tuned
Joined: May 2018
Posts: 287
Likes: 8
6.0 question
How are the FICM and crank sensor sync related? I have no sync with either, and thus no start. This has been a random ongoing issue that seems to solve itself after a couple days.
It always happens after parking overnight. Never dies while driving.
I gotta get this figured out before I actually need it to start and run one day.
It always happens after parking overnight. Never dies while driving.
I gotta get this figured out before I actually need it to start and run one day.
FTE Remembers
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
SYNC
SYNC is achieved when the PCM receives a signal from the Crankshaft sensor (CKP) indicating the sensor is working and the correct signal has been identified by the PCM. If the Crankshaft sensor is working improperly, the PCM cannot calculate engine speed or cylinder position, preventing fuel delivery.
Diagnosing SYNC:
• Using the WDS, select the SYNC PID. This PID will be viewed as a YES or NO on the top of the data screen. KOER, SYNC should always read YES.
• SYNC is totally dirived from the CKP sensor. It is possible to have no CMP sensor signal and still have SYNC (YES) and an RPM signal.
• NO SYNC and no RPM signal, typically is a faulty CKP sensor/circuit problem.
FICM SYNC
The FICM uses CMPO (Camshaft Position Sensor Output) and CKPO (Crankshaft Position Sensor Output) signals, which are sent by the PCM, to calculate FICM SYNC. FICM SYNC is calculated by the FICM and is the correlation between the camshaft pin and the crankshaft triggers. Once FICM SYNC is achieved, the FICM uses engine speed, MFDES (Mass Fuel Desired), EOT, and ICP to calculate fuel timing, pulse width, and pilot injection usage. If the CMPO and CKPO signals are not properly timed, FICM Sync may not occur.
Diagnosing FICM SYNC:
Note: Always diagnose any SYNC issues before diagnosing FICM SYNC issues.
• Using the WDS, select the FICM SYNC PID. This PID will be viewed as a YES or NO on the top of the data screen. KOER, FIDM SYNC should always read YES.
• If there is no FICM SYNC while cranking the engine, then the problem is limited to the circuit illustrated below. The FICM SYNC circuit relays information from the PCM to the FICM.
• Engine Wiring Harness: FICM SYNC occurs through two circuits between the FICM and PCM. Verify engine wiring harness circuits CMPO and CKPO. If one of these two circuits has a short/open, FICM SYNC will not occur.
PCM Powertrain Control Module
15
• PCM: If the PCM is not working properly, FICM SYNC may not occur.
• FICM: If the FICM is not working properly, FICM SYNC may not occur.
• CMP If the CMP signal is corrupt (electrical or mechanical), FICM SYNC may not occur.
SYNC is achieved when the PCM receives a signal from the Crankshaft sensor (CKP) indicating the sensor is working and the correct signal has been identified by the PCM. If the Crankshaft sensor is working improperly, the PCM cannot calculate engine speed or cylinder position, preventing fuel delivery.
Diagnosing SYNC:
• Using the WDS, select the SYNC PID. This PID will be viewed as a YES or NO on the top of the data screen. KOER, SYNC should always read YES.
• SYNC is totally dirived from the CKP sensor. It is possible to have no CMP sensor signal and still have SYNC (YES) and an RPM signal.
• NO SYNC and no RPM signal, typically is a faulty CKP sensor/circuit problem.
FICM SYNC
The FICM uses CMPO (Camshaft Position Sensor Output) and CKPO (Crankshaft Position Sensor Output) signals, which are sent by the PCM, to calculate FICM SYNC. FICM SYNC is calculated by the FICM and is the correlation between the camshaft pin and the crankshaft triggers. Once FICM SYNC is achieved, the FICM uses engine speed, MFDES (Mass Fuel Desired), EOT, and ICP to calculate fuel timing, pulse width, and pilot injection usage. If the CMPO and CKPO signals are not properly timed, FICM Sync may not occur.
Diagnosing FICM SYNC:
Note: Always diagnose any SYNC issues before diagnosing FICM SYNC issues.
• Using the WDS, select the FICM SYNC PID. This PID will be viewed as a YES or NO on the top of the data screen. KOER, FIDM SYNC should always read YES.
• If there is no FICM SYNC while cranking the engine, then the problem is limited to the circuit illustrated below. The FICM SYNC circuit relays information from the PCM to the FICM.
• Engine Wiring Harness: FICM SYNC occurs through two circuits between the FICM and PCM. Verify engine wiring harness circuits CMPO and CKPO. If one of these two circuits has a short/open, FICM SYNC will not occur.
PCM Powertrain Control Module
15
• PCM: If the PCM is not working properly, FICM SYNC may not occur.
• FICM: If the FICM is not working properly, FICM SYNC may not occur.
• CMP If the CMP signal is corrupt (electrical or mechanical), FICM SYNC may not occur.
Thread
Thread Starter
Forum
Replies
Last Post
