Dodge Caravan:

No power to starter relay

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#1 7/8/2010 10:28 AM

big daddy
New member
Registered: 7/8/2010
Posts: 1

No power to starter relay

2002 dodge caravan will not start.  Have checked all fuses and relays.  Battery is good.  All accessories work fine.  Van will try to start when I trip the starter relay, but will not catch.  Plugged into code scanner and showed no faults.  Watched while key was turned to start and the starter relay is not activating.  Switched relay for new one and still does the same thing.  Could the ignition switch or coil cause not having power to the starter relay, or is this the computer?

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#2 7/8/2010 6:39 PM

TechHelp2
Administrator
Registered: 11/23/2009
Posts: 1242

Re: No power to starter relay

I found this information on the AllData Website. See if this helps you out.

WARNING: CHECK TO ENSURE THAT THE TRANSMISSION IS IN THE PARK/NEUTRAL POSITION WITH THE PARKING BRAKE APPLIED.

Relay Test:
The starter relay is located in the Power Distribution Center (PDC) in the engine compartment. Refer to the PDC label for relay identification and location.

Remove the starter relay from the PDC as described in this group to perform the following tests:

A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK, go to next step. If not OK, replace the faulty relay.

Resistance between terminals 85 and 86 (electromagnet) should be 75 ±5 ohms . If OK, go to next step. If not OK, replace the faulty relay.

Connect a battery B+ lead to terminals 86 and a ground lead to terminal 85 to energize the relay. The relay should click. Also test for continuity between terminals 30 and 87, and no continuity between terminals 87A and 30. If OK, refer to Relay Circuit Test procedure. If not OK, replace the faulty relay.

Relay Circuit Test:

The relay common feed terminal cavity (30) is connected to battery voltage and should be hot at all times. If OK, go to next step. If not OK, repair the open circuit to the PDC fuse as required.

The relay normally closed terminal (87A) is connected to terminal 30 in the de-energized position, but is not used for this application.

The relay normally open terminal (87) is connected to the common feed terminal (30) in the energized position. This terminal supplies battery voltage to the starter solenoid field coils. There should be continuity between the cavity for relay terminal 87 and the starter solenoid terminal at all times. If OK, go to next step. If not OK, repair the open circuit to the starter solenoid as required.

The coil battery terminal (86) is connected to the electromagnet in the relay. It is energized when the ignition switch is held in the Start position and the clutch pedal is depressed (manual trans). Check for battery voltage at the cavity for relay terminal 86 with the ignition switch in the Start position and the clutch pedal is depressed (manual trans), and no voltage when the ignition switch is released to the ON position. If OK, go to next step. If not OK, check for an open or short circuit to the ignition switch and repair, if required. If the circuit to the ignition switch is OK, see the Ignition Switch Test procedure in this group.

The coil ground terminal (85) is connected to the electromagnet in the relay It is grounded through the transmission range sensor only when the gearshift selector lever is in the Park or Neutral positions. Check for continuity to ground at the cavity for relay terminal 85. If not OK with an automatic transmission, check for an open or short circuit to the transmission range sensor and repair. It is grounded by the PCM if the conditions are right to start the car. For automatic transmission cars, the PCM must see Park Neutral switch and near zero engine rpm. For manual trans. cars the PCM only needs to see near zero engine rpm. Check for continuity to ground while the ignition switch is in the start position. If not OK and the vehicle has an automatic trans. verify Park Neutral switch operation. If that checks OK check for continuity between PCM and the terminal 85. Repair open circuit as required. If OK, the PCM may be defective.

If you need wire schematics you can find them at ALLDATAdiy.com.

Let us know how you make out.

Last edited by TechHelp2 (7/8/2010 6:48 PM)


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#3 1/13/2017 7:49 AM

LSUfan71
New member
Registered: 1/12/2017
Posts: 4

Re: No power to starter relay

The Flexplate is fine.  If the teeth on the flexplate don't line up perfectly with the drive gear as it extends then it will slightly move the flexplate in order to engage.  If the drive gear doesn't have enough voltage from the solenoid as it extends then it won't have enough force to engage the flexplate.  This is what I'm trying to diagnose.

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#4 1/13/2017 10:14 AM

TechHelp2
Administrator
Registered: 11/23/2009
Posts: 1242

Re: No power to starter relay

The transmission range selector is for shifting of the transmission into the different combination of gear shifts. It connects to the TCM (transmission control module).

The park/neutral starting switch is the center terminal of the 3 terminal switch. It provides ground for the starter solenoid circuit through the selector lever in only Park (P) and Neutral (N) positions. The back-up lamp switch circuit is through the two outside terminals of the 3 terminal switch.

Check for continuity to ground while the ignition switch is in the start position. If not OK and the vehicle has an automatic trans verify park neutral switch operation.
If that checks OK check for continuity between PCM and the terminal 85. On plug C1 of the PCM check for ground on wire 31 while cranking. Repair open circuit as required. If OK, the PCM may be defective.

To test the switch, remove wiring connector from switch and test for continuity between center pin of switch and transaxle case. Continuity should exist only when transaxle is in Park or Neutral.Check gearshift cable adjustment before replacing a switch which tests bad.

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If this information is wrong please give us your vehicle information and not use some one else's post. I can help you better if you give me your actual vehicle year, make, model and engine size with your actual explanation of your problem.

I hope this information helps.


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#5 1/13/2017 11:16 AM

LSUfan71
New member
Registered: 1/12/2017
Posts: 4

Re: No power to starter relay

TechHelp2 wrote:

If this information is wrong please give us your vehicle information and not use some one else's post. I can help you better if you give me your actual vehicle year, make, model and engine size with your actual explanation of your problem.

I hope this information helps.

I created a new thread and used someone else's post only because I needed to quote your diagnosis instructions.

I provided the year, make, model in my original thread, and in my second post I gave the engine.

My post in the older thread was simply an accident.  Thanks for nothing.

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