P1606 code, ECM Relay
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From: Baltimore
P1606 code, ECM Relay
The Jag has been sitting for a few weeks and I decided to shake the dust off it and go for a drive. Immediately after starting I get a check engine light with P1606 and C1175 codes. C1175 is easy, rear wheel driver side sensor.
P1606 is a problem with the ECM relay. ECM relay clicks when I turn the key on so I looked in the X-Type Workshop Manual for what to check next. The first check it says I should do is measure the voltage between "ECM control relay JB34 pin 131 and Ground." In the rest of the workshop manual and in the Electrical Guide there is no mention of JB34. JB is a Junction Box.
At first I was thinking it must refer to the ECM connector because nothing else has 131 or more pins, but when I look at the wiring diagrams that doesn't make sense. For example one of the checks is to measure EN16 pin 40 to JB34 pin 134. EN is the ECM connector. So what is JB34??
The Workshop Manual I am using covers MY 2001 to 2009. The Electrical Guide I have is for MY 2005, my car.
P1606 is a problem with the ECM relay. ECM relay clicks when I turn the key on so I looked in the X-Type Workshop Manual for what to check next. The first check it says I should do is measure the voltage between "ECM control relay JB34 pin 131 and Ground." In the rest of the workshop manual and in the Electrical Guide there is no mention of JB34. JB is a Junction Box.
At first I was thinking it must refer to the ECM connector because nothing else has 131 or more pins, but when I look at the wiring diagrams that doesn't make sense. For example one of the checks is to measure EN16 pin 40 to JB34 pin 134. EN is the ECM connector. So what is JB34??
The Workshop Manual I am using covers MY 2001 to 2009. The Electrical Guide I have is for MY 2005, my car.
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Senior Member
Joined: Jan 2018
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From: Baltimore
Rereading my own post it struck me that the manual and the Electrical Guide were different years so I looked at other Electrical Guides and found out the Power Distribution Fusebox under the hood was referred to as JB34 in 2001 and 2002. It never did have 131 pins so I'm out of luck trying to use that information. In the meantime another ride cleared the code and CEL so I'm going to chalk that up to a borderline battery from sitting that is happier now that it has been charged.
All good there for literally a minute and then Gearbox Fault. To be continued in another thread...
All good there for literally a minute and then Gearbox Fault. To be continued in another thread...
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From: Regional NSW, Australia
Greetings dh,
Did you in fact check battery state by fully charging, then measuring B+ once off-charge all night. Taking the car for a short drive is no solution if your battery is dying. CCA testing at your battery shop (usually free) is the definitive check.
Cheers and best wishes,
Did you in fact check battery state by fully charging, then measuring B+ once off-charge all night. Taking the car for a short drive is no solution if your battery is dying. CCA testing at your battery shop (usually free) is the definitive check.
Cheers and best wishes,
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Joined: Jan 2018
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From: Baltimore
Hello Ken,
Agreed the CCA test is best. Once I can get the transmission to shift again I'll put new battery on the top of my Jag to-do list. I did buy the cheapest one last time and you get what you pay for.
Agreed the CCA test is best. Once I can get the transmission to shift again I'll put new battery on the top of my Jag to-do list. I did buy the cheapest one last time and you get what you pay for.
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