Question about 2000 Chevrolet Blazer

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Just replaced fuel pump 2000 blazer. different wiring harness/connector. wired like intructions said. won't come on. no voltage present. help.

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Did you check for power before replacing the pump? It's possible that it wasn't the pump at all. Check for power to and from your fuses and fuel pump relay.....If you need, send me your email address and I can send you the wiring diagrams.

Posted on Mar 18, 2011

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My car is not starting and thinking it's the fuel pump. Try jumping it and still not go. Alternator and starter are fine. So I've removed the fuel pump from the tank. There's a white connector that...


Four wires the the sender unit. One will have 12 volts all the time with key on. This is the fuel gauge. One will have power for 2 seconds when the key is turned on. This is the fuel pump. Two of them will have a constant ground. Grounds will be black, black with a colored stripe on it, or have a black stripe. Check the harness plug plug for voltage, again it only last for 2 seconds. If you have voltage at the wire. replace the pump. If not, probe the wire about 3 inches back from the plug, check for voltage again. If you have voltage there repair or replace the plug. Most wires break right behind the harness plug.

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2002 Grand Am- replaced fuel pump twice as it was not coming on when turning on key. Hit bottom of tank and pump starts. Not thinking pump the issue after third one. Runs great but will die while...


Sounds like a loose wire connection in the wire harness connector. I would check the wiring around the connector. I don't see how 3 different pumps can do the samething and I have been doing this for 51 years.

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Es lexus 300 p 1705...What is this?


DTC P1705 - NC2 (Direct Clutch Speed Sensor) Revolution Sensor Circuit malfunction or Direct Clutch Speed Sensor Output is 300 RPM or less with Vehicle at 20 MPH or more & with Park/Neutral Position Switch Off

Most probably you have an electrical fault causing the problem and attached is a diagnostic procedure. It could be 2 separate problems and after rectifying the P1705 only would you know it is single or 2. Repair manual shows right on top of transmission, black sensor with single bolt, 2 wire plug. P/N 89413-08020 list price $113.80

NOTE: DTC P1705 is set when PCM receives 2 gear position signals at the same time.

1. Turn ignition on. If any A/T gear position indicator lights remain illuminated when gear selector is moved from that gear, go to next step. If all A/T gear position indicator lights turn off when gear selector is moved from that gear, system is okay at this time.

2. Disconnect A/T gear position switch connector. If all A/T gear position switch indicators go out, replace A/T gear position switch. If all A/T gear position switch indicators do not go out, go to next step.

3. Reconnect A/T gear position switch connector. Shift through all gear positions except Reverse. Using a DVOM, measure voltage between 16-pin PCM harness connector "D", terminal No. 6 (Green/Red wire on 2.3CL or White wire on Accord and Odyssey) and 25-pin PCM harness connector "B" terminals No. 20 or 22 (Brown/Black wires).

If battery voltage is present, go to next step. If battery voltage is not present, check for a short in Green/Red or White wire between 16-pin PCM harness connector "D" and A/T gear position indicator, or A/T gear position switch. Repair as necessary. If Green/Red or White wire is okay, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary.

4. Shift through all gear positions except Neutral and Park. Measure voltage between 16-pin PCM harness connector "D", terminal No. 13 (Blue/White wire on Accord or Light Green wire on 2.3CL and Odyssey) and 25-pin PCM harness connector "B" terminals No. 20 or 22 (Brown/Black wires). If battery voltage is present, go to next step. If battery voltage is not present, check for a short in Blue/White or Light Green wire between 16-pin PCM harness connector "D" and A/T gear position indicator, or A/T gear position switch. Repair as necessary. If Blue/White or Light Green wire is okay, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary.

5. Shift through all gear positions except "D4". Measure voltage between 16-pin PCM harness connector "D", terminal No. 9 (Light Green/Black wire on 2.3CL or Yellow wire on Accord and Odyssey) and 25-pin PCM harness connector "B" terminals No. 20 or 22 (Brown/Black wires). If battery voltage is present, go to next step. If battery voltage is not present, check for a short in Light Green/Black or Yellow wire between 16-pin PCM harness connector "D" and A/T gear position switch. Repair as necessary. If Light Green/Black or Yellow wire is okay, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary.

6. Shift through all gear positions except "D3". Measure voltage between 16-pin PCM harness connector "D", terminal No. 8 (Green/Blue wire on 2.3CL or Pink wire on Accord and Odyssey) and 25-pin PCM harness connector "B" terminals No. 20 or 22 (Brown/Black wires). If battery voltage is present, go to next step. If battery voltage is not present, check for a short in Green/Blue or Pink wire between 16-pin PCM harness connector "D" and A/T gear position indicator, or A/T gear position switch. Repair as necessary. If Green/Blue or Pink wire is okay, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary.

7. Shift through all gear positions except "2". Measure voltage between 16-pin PCM harness connector "D", terminal No. 14 (Green/Yellow wire on 2.3CL or Blue wire on Accord and Odyssey) and 25-pin PCM harness connector "B" terminals No. 20 or 22 (Brown/Black wires). If battery voltage is present, go to next step. If battery voltage is not present, check for a short in Green/Yellow or Blue wire between 16-pin PCM harness connector "D" and A/T gear position indicator, or A/T gear position switch. Repair as necessary. If Green/Yellow or Blue wire is okay, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary.

8. Shift through all gear positions except "1". Measure voltage between 16-pin PCM harness connector "D", terminal No. 15 (Light Green/White wire on 2.3CL or Brown wire on Accord and Odyssey) and 25-pin PCM harness connector "B" terminals No. 20 or 22 (Brown/Black wires). If battery voltage is present, check for loose PCM harness connectors. Replace PCM with a known- good unit if necessary. If battery voltage is not present, check for a short in Light Green/White or Brown wire between 16-pin PCM harness connector "D" and A/T gear position indicator, or A/T gear position switch. Repair as necessary. If Light Green/White or Brown wire is okay, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary.


Hope helps.

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2 Answers

I need to replace the fuel pump and the parts house sells it with wiring. Do you have a diagram of how to run the wiring?? It is for a 2000 chevy blazer. Need it asap.


Grey is the power to the fuel pump.
Purple is the power to the fuel level sensor.
One black wire should go to the frame (fuel pump ground).
The other black wire should go to a connector and back to the fuel guage.

Mar 16, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

Does the fuel pump wiring run through, or to, the body control module (BCM)? Thanks


Hello! The fuel pump, fuel pump relay, and the fuel tank pressure sensor are carried by a wiring harness to connectors that plug into the BCM...Outputs from the BCM are carried by wiring harness to there termination point and connect via plugs...Signals inter the BCM, are processed internally, and exit via connectors...Guru...Saailer

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1 Answer

2000 Blazer 4.3 no fuel


Did the new pump come with an upgraded wiring harness? GM had problems with the connector that plugs into the pump assembly on top of the tank. The better brands of pumps come with this upgraded wiring. You might want to check into that.

Feb 19, 2010 | 2000 Chevrolet Blazer

2 Answers

Put new fuel pump now the pump runs but the power wire only has 7 volts of power how much is it suppose to have


If your pump is running on 7vdc, you are not getting enough fuel pressure to sufficiently supply the engine with gas, and it will run rough, sputter, surge, backfire, all manner of unpleasant things. If this is the case, and you are reading 7vdc while the pump is connected, this could indicate a problem within the fuel pump or fuel pump electrical circuit. Turn the car off, unplug the fuel pump wire harness from the fuel pump, insert your voltmeter leads into the vehicle-to-fuel pump wire harness connector, then have a helper turn the key to "on." You will have two-three seconds before the computer senses no fuel pump return signal, and shuts off voltage to the fuel pump. Observe the voltage coming from the vehicle wire harness to the fuel pump connector, it should be 11-13vdc. If it is, and only drops to 7vdc when connected, there is a partial short in the wiring from the point the fuel pump plugs into the harness, or the pump just creates a large voltage drop. Every device causes a voltage drop while in use, but 5vdc is too much of a loss. Re-examine the fuel pump installation, and make sure there are no obstructions over the fuel pump inlet, and that the wire harness inside the tank is okay.

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1 Answer

Fuel pump does not come on fuses good replaced relay service engine soon light on but leaving no code


Check the pump harness for power. I suggest probing wiring before the connector if you have no voltage at the connector as plug connectors sometimes go bad. If there is power at the harness and a good ground, the pump should come on...if not it's bad.

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