TurboCaterpillar Diesel ECM

SPN 102 FMI 4

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

Turbocharger boost control and air-handling faults.

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System

Caterpillar Turbo

Caterpillar ECM Service

Diagnostic Overview

CAT fault code 102-04 indicates intake manifold pressure or boost pressure sensor voltage below normal. The ECM may interpret this as low or invalid boost pressure, which can cause low-power complaints or derate. FMI 4 is commonly caused by a short to ground, failed sensor, or wiring problem. The turbocharger should not be replaced until the pressure sensor circuit is verified.

Likely Causes

Short to ground; failed boost pressure sensor; damaged harness; poor connector contact; low reference voltage; moisture intrusion.

What To Check First

Inspect the boost sensor connector, verify 5-volt reference and ground, test signal voltage, and compare boost reading to atmospheric pressure with key on engine off.

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Related Turbo Fault Codes

View All Turbo Codes

SPN 102 FMI 0

CAT fault code 102-00 generally relates to intake manifold pressure or boost pressure being above the expected range.

SPN 102 FMI 1

CAT fault code 102-01 generally indicates intake manifold pressure or boost pressure below the expected range.

SPN 102 FMI 3

CAT fault code 102-03 points to an intake manifold pressure or boost pressure sensor circuit voltage above normal.

SPN 102 FMI 7

CAT fault code 102-07 indicates the intake manifold pressure or boost system is not responding properly.

SPN 102 FMI 15

CAT fault code 102-15 usually indicates intake manifold pressure or boost pressure above normal at a least-severe level.

SPN 102 FMI 17

CAT fault code 102-17 generally means intake manifold pressure or boost pressure is below normal at a least-severe level.

View All Turbo Codes →