PleasureCraft Engine Group 5.0L, Diagnostic Manual

Page: 209 / 337

5.0/5.7/6.0/8.1L Diagnosis 5 - 67
MEFI 4 - PCM
Diagnostic Procedure (DP) A-5 Fuel Pump Relay Circuit Diagnosis
Step Action Value Yes No
1
Was the “On-Board Diagnostic” (OBD) system check Go to OBD
performed? — Go to Step 2 System Check
2
Check the fuel pump relay fuse.
Is the fuse open? — Go to Step 9 Go to Step 3
1. Install a scan tool.
2. Disconnect the fuel pump relay harness connector.
3. Turn ON the ignition leaving the engine OFF.
3
4. Probe the fuel pump relay battery feed circuit, terminal
“30,” at the harness connector with a test lamp
J 34142-B connected to a known good ground.
Does the test lamp illuminate? — Go to Step 4 Go to Step 12
Probe the fuel pump relay ignition feed circuit, terminal “86,”
at the harness connector with a test lamp J 34142-B
4
connected to a known good ground.
Does the test lamp illuminate? — Go to Step 5 Go to Step 13
1. Probe the fuel pump control circuit, terminal “85,” at the
harness connector with a test lamp J 34142-B
5
connected to B+.
2. Enable the fuel pump using the scan tool.
Does the test lamp illuminate for 2 seconds? — Go to Step 6 Go to Step 11
Important: Ignition must be ON before performing this
step.
6
Jumper the fuel pump relay battery feed circuit, terminal “30”
to the fuel pump load circuit, terminal “87,” at the harness
connector using a fused jumper wire.
Does the fuel pump operate? — Go to Step 18 Go to Step 7
1. Leave the fused jumper wire connected.
2. Disconnect the fuel pump harness connector at the
fuel pump.
7
3. Probe the power feed circuit in the fuel pump harness
connector with a test lamp J 34142-B connected to
a known good ground.
Does the test lamp illuminate? — Go to Step 8 Go to Step 14
1. Leave the fused jumper wire connected.
2. Connect the test lamp J 34142-B between the battery
8
feed circuit and the ground circuit in the fuel pump
harness connector.
Does the test lamp illuminate? — Go to Step 25 Go to Step 15
1. Turn OFF the ignition.
2. Remove the fuel pump fuse.
3. Disconnect the fuel pump harness connector at the
9
fuel pump.
4. Probe the load circuit for the fuel pump relay at the
harness connector, terminal “87” with a test lamp
J 34142-B connected to B+.
Does the test lamp illuminate? — Go to Step 16 Go to Step 10