2001 Isuzu Rodeo Sport wont start lights on dash

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2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Fri Apr 14, 2017 11:57 pm

My sons 2001 Isuzu Rodeo sport will not start. He woke up this morn, steering wheel was in lock position & he couldn't get key in. I went out moved the wheel, got the key in & it started. He tried to start after school and it would only crank not turn over. Added gas, not issue. Tried Jumping, not issue. As I was trying to start I noticed that the brake light, check trans & cruise control light were all on the dash. The cruise control selector switch to the left of the steering wheel was also illuminated.

I have done some reading & some people say there cold be a loose connection somewhere. Any Suggestions?
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Sat Apr 15, 2017 2:42 pm

Check for fuel pressure at the fuel rail test port. Expected value engine not running is 38-40 psi.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Tue Apr 18, 2017 12:53 am

Buster thank you for your response. I rented a Fuel Pressure Gauge and when the key was in the ON position the gauge stayed at 0. I then went to the midway point, Fuel Filter, opened the line & placed the key in the ON position, no fuel coming out of the filter. I assume that some would start to come out, I could be wrong. (When I place the key in the ON position, I here a low beep & clicking coming from a black piece right at the beginning of the fuel rail. It has a red connector and 2 wires going in.) I tried to test voltage at the connector for the fuel pump but could not get my voltage testing light to come on. I connected at the orange/black wire & got no light. to make sure my light was working I disconnecter the other connector on the fuel pump & tested for voltage, it worked. for some reason I am not getting power on the orange black wire. The fuse under the hood is not bad, I have voltage going into the fuse. Any suggestions?
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Tue Apr 18, 2017 12:58 am

one other thing, as I stated in my first post, the light on the cruise control selector is on & everytime the piece at the beginning of the fuel rail beeps & clicks, the cruise control light on the dash blinks. not sure if this has anything to do with it.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Tue Apr 18, 2017 1:07 am

the part circled in green keeps clicking.

http://i30.photobucket.com/albums/c337/ ... G_0470.jpg
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Tue Apr 18, 2017 7:53 am

Test the Fuel Pump Relay by exchanging it with another of the same type. The Fuel Pump Relay is energized for a few seconds when the Ignition is placed in the Run position to pressurize the fuel rail. The Fuel Pump Relay will energize again when the crankshaft starts to rotate and the Crankshaft Position Sensor (CKP) sends 58x pulses to the PCM.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Fri Apr 21, 2017 2:58 pm

I didn't have anything to test voltage besides light so I decided to swap out fuel pump, still no start. Friend with a bolt meter came over & no voltage at fuel pump. He made a suggestion & in going to ask because I'm unsure. When I opened the door to my sons car the alarm went off. I was able to start the car & he drove to school but it wouldn't start after that. When we purchased the car it didn't come with a keyless entry remote, sometimes the alarm will go off when you open the door with key. Question is; would the alarm disable power to the fuel pump.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Fri Apr 21, 2017 4:00 pm

A 01 Rodeo Anti-Theft system prevents the engine from being cranked when in the Alarm state it does not prevent the fuel pump from operating.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Fri Apr 21, 2017 4:38 pm

Buster28, gonna start fresh. according to my friend who is at my house using the voltmeter, he is getting no power at the fuse. Could you explain to me in simple terms how the system works. Where voltage goes when talking about the ignition, fuses, relay, ECM/PCM, fuel pump. I want to try & pinpoint where I should start looking if I have no power at Fuse.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Fri Apr 21, 2017 5:00 pm

If you look at the schematic I posted you can see there is no power to the Fuel Pump Fuse until the Fuel Pump Relay is energized. The relay is controlled by the PCM. Exchange the Fuel Pump Relay with another of the same type located in the engine compartment fuse and relay box.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Fri Apr 21, 2017 5:17 pm

When I try a different relay, will i need to have key in on position for voltage or will it be there always? if no voltage, then where next?

trying now.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Fri Apr 21, 2017 5:35 pm

The Fuel Pump Relay is energized for a few seconds when the Ignition is placed in the Run position to pressurize the fuel rail. The Fuel Pump Relay will energize again when the crankshaft starts to rotate and the Crankshaft Position Sensor (CKP) sends 58x pulses to the PCM.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Fri Apr 21, 2017 7:33 pm

Buster, I somewhat understand the schematic. I swapped relays, no power at the fuse. Pulled relay, no power at the connector for the pink wire. where do I go from here.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Fri Apr 21, 2017 7:57 pm

Trying to figure myself while I wait for your response. I took my light connected one end to ground & the other end to pin 42 on the Blue/A connector to see if power came out when key was turned to on position. nothing. I hope this was your next step & I did it correctly.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Sat Apr 22, 2017 6:34 am

No power at Pin 42 suggests that there is no power being provided to the PCM. Check for a blown 30A ECM fuse and the 15A ECM Backup fuse both located in the engine compartment fuse and relay box.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Sat Apr 22, 2017 10:22 am

changed fuses. still no power at relay.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Sat Apr 22, 2017 11:47 am

There may be an issue involving the PCM/ECM power relay. Remove one of the fuel injector connectors and see if there is +12 Vdc being supplied to Pin 1 of the selected fuel injector connector when the Ignition Switch is in the Run (On) position.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Sun Apr 23, 2017 3:34 pm

I purchased a voltmeter. here are some readings at various points:

Battery -11.97
IGN @ relay - 11.95
Pink wire from PCM @ relay - Consistent 3.47 volts. I mean that the voltage stays on the line for over a minute. I thought it was a few seconds until the crankshaft position sensor took over.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Sun Apr 23, 2017 3:48 pm

ok, did a little research, correct me if I am wrong. pink/ white wire doesn't send 12v to relay but a signal to relay to openand allow 12v from IGN to go to fuse then to fuel pump. correct?
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Sun Apr 23, 2017 4:29 pm

Buster, a small lucky/unlucky update. I tested pin 1 of one of the injectors, 2.2v. LUCKY. I read to try & bypass the relay using a small piece of wire to see about voltage. I accidentally touch IGN to ground @relay & had a small spark. Then I placed wire from ign to blk/red & started to get power at fuse & pump. I put relay back in, turn key to on position, have 12v at fuse, pump & injector. UNLUCKY. Now when I place key in on position I hear a ringing noise from the throttle body. I am going to put fuel pump back in & give it a shot. I will keep you posted if I don't hear from you first.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Sun Apr 23, 2017 6:39 pm

vitamin_g wrote:ok, did a little research, correct me if I am wrong. pink/ white wire doesn't send 12v to relay but a signal to relay to openand allow 12v from IGN to go to fuse then to fuel pump. correct?

The Pink/ White wire from PCM E-21 Pin 42 is connected to the coil of the Fuel Pump Relay. The other side of the Fuel Pump Relay coil is connected to ground. The Fuel Pump Relay is acting as a switch, when the PCM applies a battery voltage level signal (typically about 12.6 Vdc) to coil of the relay it energizes and connects battery voltage to the Fuel Pump Relay fuse which provides battery voltage to start the Fuel Pump. The relay will not work if the voltage applied to the coil is less than about 8 Vdc. A 3.47 Vdc measurement indicates a problem. Once the engine starts the alternator takes over and the voltages increase to about 14.4 Vdc.

Additionally, the voltage on Pin 1 of the injector should be about 12.6 Vdc, 11.97 Vdc in this case.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Wed Apr 26, 2017 10:34 pm

Buster, a little after I posted my message on Sunday the car went back into no start mode. I am going to go out there tonight & get voltages at all the points you have told me. I will keep you updated.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Thu Apr 27, 2017 12:43 am

Voltage on the pink/white pin is 3.37v & at pin one on the injector connector is 3.27v.
what next?
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby Buster28 » Thu Apr 27, 2017 5:44 am

The Fuel Pump Relay and the Fuel Injectors will not operate on 3.27 Vdc. The Fuel Injectors receive battery voltage ("+12 Vdc") from the ECM/PCM Main Power Relay which effectively connects the positive terminal of the battery to Pin 1 of all six Fuel Injectors and the PCM when the Ignition Switch is in the Run/Crank position.

There is a loose connection somewhere, make sure the battery terminals/cables are clean and tight. Both positive and negative.
Check the voltage at the 30Amp ECM fuse and then Pin 2 of the ECM/PCM Main Power Relay. The expected voltage is equal to the battery voltage.
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Re: 2001 Isuzu Rodeo Sport wont start lights on dash

Postby vitamin_g » Fri Apr 28, 2017 12:18 am

ok, a bit of confusion on the pin count on the ECM/PCM relay. Please zoom in twice to see my sorry attempt at a pic.

The count on the actual relay is as follows:

Printed on Relay:
relay pic.png



Based on your diagram & opening the fuse box & looking at wire colors its as follows:
actual.png


1 = red/green, to Injectors/PCM, 12v leaving the ECM/PCM Main Relay on wire under the fuse box
2 = red/white, from 30Amp ECM fuse, 12v disappears when 30Amp fuse removed
3 = black, ground
4 = open
5 = black/yellow, 12v when key in on position

I think that the diagram & colors set up is correct. Where does the red/green wire go to after it leaves the fuse box?
I hope that all made sense. also, I apologize that these come across so late. I can only work on my sons car when I get home from work, thx.
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