No spark + "No Link" code
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Junior User
Joined: Nov 2008
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No spark + "No Link" code
Hello all. 99 F-150, 185K miles, 4.2L 6 cylinder, Auto, 2WD.
Also posted in 6 cylinder engine forum.
Truck parked about 12 months but started and run regularly. Now no spark. Recent (within 10K miles) coil pack, wires and plugs. Pulled plug and appeared ok, minor soot and tan electrode. Sprayed starter fluid into throttle body... nothing. Not even a misfire or sputter.
fresher battery installed, Grounds all good. Checked fuses and all appear good.
Put cose scanner on and it says "No Link". Hmm. Once hefore this happened and it was a 20amp (yellow) fuse. but I never had no spark.
Motor turns over fine.
I know this is not a easy one, but can you help us get this going? ANY ideas are a help.
Like I said it always ran great; never had no spark.
Thank You
Also posted in 6 cylinder engine forum.
Truck parked about 12 months but started and run regularly. Now no spark. Recent (within 10K miles) coil pack, wires and plugs. Pulled plug and appeared ok, minor soot and tan electrode. Sprayed starter fluid into throttle body... nothing. Not even a misfire or sputter.
fresher battery installed, Grounds all good. Checked fuses and all appear good.
Put cose scanner on and it says "No Link". Hmm. Once hefore this happened and it was a 20amp (yellow) fuse. but I never had no spark.
Motor turns over fine.
I know this is not a easy one, but can you help us get this going? ANY ideas are a help.
Like I said it always ran great; never had no spark.
Thank You
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Junior User
Joined: Nov 2008
Posts: 61
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This afternoon, I swaped some of the relays around (by recommendation) to no success.
How do I check the PCM power? Where can I start?
I know this is tough but this thing ALWAYS started and ran. For it to lose spark just baffels me, along with the 'no link' code.
Thank You.
How do I check the PCM power? Where can I start?
I know this is tough but this thing ALWAYS started and ran. For it to lose spark just baffels me, along with the 'no link' code.
Thank You.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
99 4.2 PCM Power checks
Quick check for PCM power: Observe MIL at power on. If lit, the PCM is receiving power. Secondary check: Look for +5V at the TPS BRn/WT to TPS RED/GRY.
If no PCM power, check following:
CJB F30 - HOT in START/RUN - Required to energize PCM Power Relay
BJB F2 - Supplies power via NO PCM relays to following three fuses in the BJB:
F18 - PCM, MAF, IAC, injectors, energizes FP relay
F23 - Supplies power to various solenoids and upstream O2 heaters, IMRC, and cam sensor
F24 - downstream O2 heaters, auto transmission
If no PCM power, check following:
CJB F30 - HOT in START/RUN - Required to energize PCM Power Relay
BJB F2 - Supplies power via NO PCM relays to following three fuses in the BJB:
F18 - PCM, MAF, IAC, injectors, energizes FP relay
F23 - Supplies power to various solenoids and upstream O2 heaters, IMRC, and cam sensor
F24 - downstream O2 heaters, auto transmission
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blairsie
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 5, 2018 05:41 PM
