MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-613
STEP 8. Check the power supply voltage at ECM harness
side connector C-58 <M/T> or PCM harness side connector
C-55 <A/T>.
(1) Disconnect the connector C-58 <M/T> or C-55 <A/T> and
measure at the harness side.
(2) Measure the voltage between terminal 57 <M/T> or 49 <A/
T> and ground.
•
Voltage should be battery positive voltage.
Q: Is the voltage normal?
YES :
Go to Step 9.
NO :
Repair harness wire between MFI relay connector A-
18X terminal 3 and ECM connector C-58 terminal 57
<M/T> or PCM connector C-55 terminal 49 <A/T>
because of open circuit. Then confirm that the
malfunction symptom is eliminated.
STEP 9. Check the power supply voltage at ECM harness
side connector C-58 <M/T> or PCM harness side connector
C-55 <A/T>.
(1) Disconnect the connector C-58 <M/T> or C-55 <A/T> and
measure at the harness side.
(2) Using a jumper wire, connect terminal 57 <M/T> or 49 <A/
T> to ground.
(3) Measure the voltage between terminal (47, 59) <M/T> or
(41, 47) <A/T> and ground.
•
Voltage should be battery positive voltage.
Q: Is the voltage normal?
YES :
Replace the ECM or PCM. Then confirm that the
malfunction symptom is eliminated.
NO :
Repair harness wire between MFI relay connector A-
18X terminal 4 and ECM connector C-58 terminal (47,
59) <M/T> or PCM connector C-55 terminal (41, 47)
<A/T> because of open circuit. Then confirm that the
malfunction symptom is eliminated.
AK000378AC
47 46 45
41
42
43
44
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
<M/T>
C-58 HARNESS
SIDE CONNECTOR
AK000379AD
<A/T>
C-55 HARNESS
SIDE CONNECTOR
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
AK000380AC
47 46 45
41
42
43
44
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
<M/T>
C-58 HARNESS
SIDE CONNECTOR
AKX01438
<A/T>
C-55 HARNESS
SIDE CONNECTOR
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
AH
