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Old 09-01-2016, 03:31 PM   #1
lbobcat
Scooby Newbie
 
Member#: 290006
Join Date: Jul 2011
Location: INDY
Vehicle:
2004 WRX
World Rally BLue

Default No power to cam and crank position sensor

98 2.5rs auto.
Brand new denso starter
New battery
12.7 on multimeter.

***Updated issue***
*Car is cranking better. The issue now is not getting power at the cam and crank position sensor. Measuring across the sensor and from the sensor to battery ground all yield 0 volts. I checked the injector wire connector and it was getting voltage. I also checked all of the fuses even the sbf ones and they are good. *

Issue I'm having is slow crank and stuttering crank.
Video of issue.

Subaru starter impreza gc8 rs - YouTube

The voltage reads good on the connections, but is it possibly not allowing enough current and should get new wires
Have power connected to starter and ground on the mounting bolt into bell housing. Thanks in advance for the help.
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Old 09-02-2016, 02:01 AM   #2
CosmoTheCat
Scooby Newbie
 
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
Vehicle:
98 My FMIC
Is bigger than yours.

Default

Well, if you're note getting voltage at those two sensors, check the bulkhead to engine harness connector for loose/missing pins, and check for voltage at the ECM.
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Old 09-02-2016, 02:39 PM   #3
lbobcat
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Member#: 290006
Join Date: Jul 2011
Location: INDY
Vehicle:
2004 WRX
World Rally BLue

Default

Thanks are there any relays at the ecm to check as well.
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Old 09-02-2016, 08:48 PM   #4
Cougar4
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Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

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The Main Relay supplies power to the ECM and other engine related components. The ignition switch also provides power to the ECM.
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Old 09-03-2016, 12:55 PM   #5
Elbert Bass
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Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Default

Unless the engine is running (or cranking) you will not get voltage at crank or cam sensors. Those are not Hall sensors that require power - they are inductive pickups. They generate a pulse when the engine is turning. The I/O chart calls for a -7 to +7 volt waveform at the ECM engine running and 0 volts engine not running.
To test sensors and if ECM is getting signal test for pulsing voltage with engine cranking at ECM. I prefer using an osciloscope if I have one handy. For crank sensor test connector B84 pin 8 black wire, for cam sansor connector B84 pin 7 white wire. These colors are per the FSM and the wires are the larger size pins along one side of the connector.
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Old 09-07-2016, 11:56 PM   #6
CosmoTheCat
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Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
Vehicle:
98 My FMIC
Is bigger than yours.

Default

Derp. Yeah. What he said.
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