Appstate97 Posted June 20, 2017 Posted June 20, 2017 Pull the relay out. Take measurements from the pin to any ground. Refer to the following link: http://www.bteventures.com//mj1988electricalmanual.pdf Engine schematic: pg 14 Harness view: pg 89 & 90 Connector view: pg 75 C106_D1-5 is the connector with the yellow cover on it. Thanks for the resource. I cleaned and reinstalled the dipstick ground, 4 relays, connectors near it, and C101 connector. I checked C106 D1-5 and only got a reading on the batt. Pin (5.6 reading). C103 B got a reading of .12. All readings had the ignition on and everything reinstalled.
Ωhm Posted June 20, 2017 Posted June 20, 2017 Your dropping voltage between C103_B and C106_D1-5. Suspect splice E. Page 89. Little circle with an E in it.
Appstate97 Posted June 20, 2017 Posted June 20, 2017 Your dropping voltage between C103_B and C106_D1-5. Suspect splice E. Page 89. Little circle with an E in it. I'm in the harness and it's a bit of a mess. What am I looking for?
Appstate97 Posted June 20, 2017 Posted June 20, 2017 Your dropping voltage between C103_B and C106_D1-5. Suspect splice E. Page 89. Little circle with an E in it. Sent PM
Appstate97 Posted June 20, 2017 Posted June 20, 2017 Five (5) red wires tied together. I found the 5 red wires and they were hanging on by a thread. I kept moving up the harness and found the yellow wires in a similar state, slightly better but not much. I don't have a collector big enough to grab the wires before soldering so I swing by the auto parts store or harbor freight tomorrow. Thanks for the help. Can you think of anything else that might need to be checked?
cruiser54 Posted June 20, 2017 Posted June 20, 2017 Five (5) red wires tied together. I found the 5 red wires and they were hanging on by a thread. I kept moving up the harness and found the yellow wires in a similar state, slightly better but not much. I don't have a collector big enough to grab the wires before soldering so I swing by the auto parts store or harbor freight tomorrow. Thanks for the help. Can you think of anything else that might need to be checked? One thing at a time. Fix known problems and move on.
Ωhm Posted June 20, 2017 Posted June 20, 2017 Might have another case of an open ended wire (not used). Yellow seems like splice F. Pg 16 upper left corner. Lets find out. Disconnect Battery. Continuity check the following (ohmmeter) for zero (0) ohms. Between C107_D2-4 and C216_5 (relay removed) Between C107_D2-4 and C228_1 (relay removed) Between C103_E and splice F. Anyone of these will confirm splice F.
Appstate97 Posted June 20, 2017 Posted June 20, 2017 Both Batt terminals disconnected and all relays pulled. C107 D2-4 and C216 fuel pump relay: D2-4 and Pin 30: meter didn't jump D2-4 and pin 86: all jumped D2-4 and pin 87: all jumped D2-4 and pin 85: meter didn't jump C107 to C228 oxygen sensor heater relay D2-4 and pin 30: all jumped D2-4 and pin 87: NO CONNECTOR D2-4 and pin 86: all jumped D2-4 and pin 85: #2 and #4 jumped I already heat wrapped splice F. Do you need the data from it. Or is this information good?
Ωhm Posted June 20, 2017 Posted June 20, 2017 No need to undo anything. Info only. Don't understand "all jumped". Looking for zero (0) ohms. Sound like yellow is splice F.
Appstate97 Posted June 20, 2017 Posted June 20, 2017 When I hooked up the meter it showed a reading. For example on the fuel pump relay C107 D2 and fuel pump relay pin 87: The meter read 5.6 I have the ohms meter set for 200k and I plugged the red wire in C107 D2 and black wire in the fuel pump relay pin 87
Ωhm Posted June 20, 2017 Posted June 20, 2017 200k good scale. Measure from C107_D2-4 to C216_5 (relay pin 86). Looking for zero ohms.
Ωhm Posted June 20, 2017 Posted June 20, 2017 D2 and D3 don't matter. There not on the circuit being tested. D4: 0 confirms splice F (yellow wires). Make repairs, connect battery, cross fingers and start vehicle. Let us know.
Appstate97 Posted June 20, 2017 Posted June 20, 2017 Does the oxygen sensor need an 87 pin on the relay?
Ωhm Posted June 20, 2017 Posted June 20, 2017 No. O2 relay uses pin 87 to bypass the fuel pump ballast resistor during a WOT condition. Your vehicle is not equipped with ballast resistor.
Appstate97 Posted June 20, 2017 Posted June 20, 2017 Put everything back together and she wouldn't start. So I jumped the fuel pump relay and left the pump running while I tried to start her and she fired up and ran until I pulled the jumper. Does that mean my relay is bad? I tried switching them around and had no luck.
cruiser54 Posted June 21, 2017 Posted June 21, 2017 A thought. What if appstate97 had an 87 that had the fuel pump ballast resistor retrofit deal done on it?
Appstate97 Posted June 21, 2017 Posted June 21, 2017 I just searched around but can't finigure out what a resistor retrofit is.
Appstate97 Posted June 21, 2017 Posted June 21, 2017 I measured the volts to the fuel pump with the ignition off and got a reading of 0. Then I took a reading with the ignition on and got a reading of 6.78 volts. Shouldn't the pump get 12 volts from a start?
Appstate97 Posted June 21, 2017 Posted June 21, 2017 Which wires can I check at the C101 to get a volt reading for my fuel pump?
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