This CAT 0190-02 engine speed troubleshooting document covers the diagnostic procedure for fault code 0190-02 (FMI 02) — Primary Engine Speed Loss of Signal (34) — on Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It explains the conditions that generate the code, the ECM system response, possible performance effects, and the required test steps to resolve the issue.
Official CAT 0190-02 engine speed troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, or 1LW) |
| System / Group | DTCs — Engine Speed/Timing Sensor Circuit (SMCS 1912-038) |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code (PID 0190 FMI 02)
- System Response — ECM failover to secondary speed/timing sensor
- Possible Performance Effect — engine shutdown risk if secondary signal is also lost
- Troubleshooting — Test Step 1: Engine Speed/Timing Sensor Circuit – Test
Applicable truck models
This publication applies to Caterpillar on-highway truck engines in the following configurations: 3406E, C-10, and C-12 with serial prefix groups 8YS, 9NS, 5DS, or 1LW. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP. The fault code PID 0190 FMI 02 is triggered when the Engine Control Module (ECM) detects that the primary engine speed/timing signal was lost and returned within one second, the engine had been running for more than three seconds, speed did not pass through the 350 to 500 rpm range, and battery voltage exceeded 9 VDC prior to the fault. When this code is active, the ECM switches to the secondary speed/timing sensor and Caterpillar Electronic Technician (ET) displays “DIAG” next to the Engine Speed status. For additional Caterpillar technical resources, visit Caterpillar Official Support.
Who needs this CAT 0190-02 engine speed troubleshooting manual
Diesel mechanics and workshop owners working on 3406E, C-10, or C-12 powered trucks need this document when diagnosing an active 0190-02 diagnostic trouble code. It provides the exact conditions, ECM behavior, and the referenced test procedure — Engine Speed/Timing Sensor Circuit – Test — required to isolate and correct the fault.
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