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kdracer73 · 01-03-2011, 01:12 PM

found this also:
Printer Friendly Confirmed Fix Vehicle Application: 1987 Ford Ranger Super 2.9L, Vin T, Eng Cfg V6

Customer Concern: The engine died while driving. There is no injector pulse, spark is OK. The computer will not communicate with the scanner to do the self test. There is no voltage to the reference voltage (vref) circuit of the Throttle Position Sensor (TPS).
Tests/Procedures: 1. Disconnect the Manifold Absolute Pressure (MAP) sensor, Pressure Feedback EGR (PFE) Sensor, and TPS one at a time to see if the 5v vref returns on the Orange/White (O/W) wire.

2. If the voltage does not return with all sensors disconnected, access the Powertrain Control Module (PCM) behind the Right Hand (RH) kick panel inside the truck. Check for battery voltage on pin 37 and 57 Red wires. Check for ground on pins 20, 40 and 60 (should all be Black/Light Green (BK/LG) wires).

3. If the powers and grounds are OK, locate the O/W wire at pin 26. Go several inches from the PCM and cut the wire. Recheck for 5v on the wire coming out of the PCM. If voltage is not present, replace the PCM and recheck operation.

4. If the voltage returns with the O/W wire cut, locate and repair the short to ground in the wire harness.
Potential Causes: Harness
Shorted MAP Sensor
Powertrain Control Module (PCM)
Shorted Pressure Feedback EGR (PFE) Sensor
Shorted Throttle Position Sensor (TPS)

Diagnostic Codes: None
Author: Bob Mordorski
Average Reported Mileage: 120000

Confirmed Fix Summary

Confirmed Fix 1 - Electronic Engine Control (EEC) Power Relay
1 - Powertrain Control Module (PCM)
1 - Powertrain Control Module (PCM) Ground Supply

Confirmed Fix Details

Tech Reported Fix Details Confirmed Fix
Jim Cruse
March 01, 2010 1989 Ford Ranger, Super 2.9L, Vin T, FI, Eng Cfg V6 *
Replaced Electronic Engine Control (EEC) Power Relay
- Traced problem to a bad EEC relay, when problem occured, there was 1 volt on 5 volt circuits, and injectors had 5 volts. Electronic Engine Control (EEC) Power Relay
Patrick Gleason
October 30, 2006 1987 Ford Ranger, Super 2.9L, Vin T, Eng Cfg V6 *
Replaced Powertrain Control Module (PCM)
120,000 miles Powertrain Control Module (PCM)
Adam Busch
December 12, 2006 1987 Ford Ranger, Super 2.9L, Vin T, Eng Cfg V6 *
Powertrain Control Module (PCM) Ground Supply
- Checked and found voltage on ground side of pcm. Unplugged pcm and voltage went away. Found pcm ground wire damaged at battery cable. Repaired ground wire.

01-03-2011, 01:12 PM	#5
kdracer73 Senior Member Join Date: Apr 2008 Posts: 1,557 Tweet	found this also: Printer Friendly Confirmed Fix Vehicle Application: 1987 Ford Ranger Super 2.9L, Vin T, Eng Cfg V6 Customer Concern: The engine died while driving. There is no injector pulse, spark is OK. The computer will not communicate with the scanner to do the self test. There is no voltage to the reference voltage (vref) circuit of the Throttle Position Sensor (TPS). Tests/Procedures: 1. Disconnect the Manifold Absolute Pressure (MAP) sensor, Pressure Feedback EGR (PFE) Sensor, and TPS one at a time to see if the 5v vref returns on the Orange/White (O/W) wire. 2. If the voltage does not return with all sensors disconnected, access the Powertrain Control Module (PCM) behind the Right Hand (RH) kick panel inside the truck. Check for battery voltage on pin 37 and 57 Red wires. Check for ground on pins 20, 40 and 60 (should all be Black/Light Green (BK/LG) wires). 3. If the powers and grounds are OK, locate the O/W wire at pin 26. Go several inches from the PCM and cut the wire. Recheck for 5v on the wire coming out of the PCM. If voltage is not present, replace the PCM and recheck operation. 4. If the voltage returns with the O/W wire cut, locate and repair the short to ground in the wire harness. Potential Causes: Harness Shorted MAP Sensor Powertrain Control Module (PCM) Shorted Pressure Feedback EGR (PFE) Sensor Shorted Throttle Position Sensor (TPS) Diagnostic Codes: None Author: Bob Mordorski Average Reported Mileage: 120000 Confirmed Fix Summary Confirmed Fix 1 - Electronic Engine Control (EEC) Power Relay 1 - Powertrain Control Module (PCM) 1 - Powertrain Control Module (PCM) Ground Supply Confirmed Fix Details Tech Reported Fix Details Confirmed Fix Jim Cruse March 01, 2010 1989 Ford Ranger, Super 2.9L, Vin T, FI, Eng Cfg V6 * Replaced Electronic Engine Control (EEC) Power Relay - Traced problem to a bad EEC relay, when problem occured, there was 1 volt on 5 volt circuits, and injectors had 5 volts. Electronic Engine Control (EEC) Power Relay Patrick Gleason October 30, 2006 1987 Ford Ranger, Super 2.9L, Vin T, Eng Cfg V6 * Replaced Powertrain Control Module (PCM) 120,000 miles Powertrain Control Module (PCM) Adam Busch December 12, 2006 1987 Ford Ranger, Super 2.9L, Vin T, Eng Cfg V6 * Powertrain Control Module (PCM) Ground Supply - Checked and found voltage on ground side of pcm. Unplugged pcm and voltage went away. Found pcm ground wire damaged at battery cable. Repaired ground wire. __________________ I drive a hybrid, It burns gas and rubber.. Alcohol Tobacco & Firearms should be a convenience store, not a government agency.