This 10-page PDF is a CAT C15 battery power troubleshooting guide covering diagnostic code 0168-02 ECM Battery Power Intermittent for Caterpillar C15 on-highway truck engines (MXS, NKS, RKS configurations). The document provides step-by-step test procedures for diagnosing intermittent battery voltage drops, faulty charging systems, and poor battery connections affecting the ECM.
Official CAT C15 battery power document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP), NKS, RKS |
| System/Group | DTCs — SMCS 1401-038; 1553-038 |
| Publication no. | RENR5088-10 |
| Year/Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 10 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0168-02 ECM Battery Power Intermittent (51) — Conditions, System Response
- Ignition Keyswitch Circuit and Battery Supply Circuit — Test (System Operation Description)
- ECM Battery Circuit Schematic (Illustration 1)
- Test Step 1: Inspect the Electrical Connectors and the Wiring
- Test Step 2: Use Cat ET to Check for Communications with the ECM
- Test Step 3: Check for Active Diagnostic Codes or Logged Diagnostic Codes
- Test Step 4: Check for Battery Voltage at the ECM Connector
- Test Step 5: Check the Batteries (Load Test using 4C-4911 Battery Load Tester)
- Test Step 6: Bypass Vehicle Wiring Using 167-9225 Harness (Service Tool Adapter)
Applicable truck models
This document applies to Caterpillar C15 on-highway truck engines in MXS00001-UP configuration. It is relevant to any vehicle equipped with a CAT C15 engine where DTC 0168-02 is active or logged, as well as related codes 43-2 Key Switch Fault, 168-0 Excessive ECM Battery Power, 168-1 Low ECM Battery Power, 168-3 High ECU Battery Power, and 168-4 Low ECU Battery Power. The procedure covers both 12-volt and 24-volt electrical systems. Terminal locations referenced include P1-48, P1-52, P1-53 (unswitched +Battery), P1-63, P1-65, P1-67 (-Battery), and P1-70 (keyswitch) at the J1/P1 ECM connectors. For official Caterpillar service resources, visit Caterpillar Support.
Who needs this CAT C15 battery power manual
Diesel mechanics and workshop owners diagnosing intermittent ECM shutdowns, derated engine conditions, or check engine lamp illumination on C15-powered trucks will find this document essential. It is also required when Caterpillar Electronic Technician (Cat ET) cannot establish communications with the ECM or when the engine cranks but will not start.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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