Navistar International DT 466 Diagnostic/Troubleshooting Manual page 415

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Figure 440 EFP circuit diagram
Operational Voltage Checks for EFP Sensor with Breakout Harness (Check with breakout harness
connected to sensor and engine harness.)
Test Point
3 (Green) to 1 (Black)
3 (Green) to 1 (Black)
3 (Green) to 1 (Black)
3 (Green) to 1 (Black)
Operational Voltage Checks for EFP Sensor with Breakout Box (Check with breakout box connected
[X1 and X2 only] to the ECM and engine harness.)
X2–3 to X1–6
X2–3 to X1–6
X2–3 to X1–6
X2–3 to X1–6
EFP Diagnostic Trouble Codes
DTC 136 = Signal voltage was < 0.039 V for more than 0.35 second
DTC 137 = Signal voltage was > 4.9 V for more than 0.35 second
DTC 371 = Measured fuel pressure was greater than expected pressure by 100 kPa (15 psi) for more
than 60 seconds.
DTC 372 = Measured fuel pressure was greater than expected pressure by 103 kPa (15 psi) for more
than 30 seconds.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
EST voltage readings:
Signal to ground
0.66 V
1.65 V
3.13 V
4.1 V
0.66 V
1.65 V
3.13 V
4.1 V
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Spec
5 kPa (0.75 psi)
138 kPa (20 psi)
345 kPa (50 psi)
483 kPa (70 psi)
5 kPa (0.75 psi)
138 kPa (20 psi)
345 kPa (50 psi)
483 kPa (70 psi)
EGES-270-1
Comment
Voltage with key-on engine-off.
Voltage with key-on engine-off.
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