How to Clear Komatsu Error Codes - CA132

By Content Sinocmp · 8 août 2025

As a professional supplier of construction machinery parts and solutions, SINOCMP understands that unplanned downtime due to engine issues can derail your project timeline and profitability. That’s why we’re breaking down common Komatsu engine fault codes to help you diagnose problems quickly, backed by our expertise in genuine and aftermarket parts support. Let’s dive into the most frequent codes, their causes, and how to address them, with insights to keep your equipment running at peak performance.

1. Fault Code [CA132]: Throttle Sensor Low Voltage Fault

User Code	E14	Failure	Throttle Sensor Low Voltage Fault (Engine Controller System)
Fault Code	CA132
Failure Details	Low voltage detected in the throttle sensor signal circuit.
Controller Response	If the fault occurs when the start switch is in the ON position, the controller will fix the voltage value to the level just before the fault was detected and continue operation. If the start switch is turned to the ON position when the voltage is abnormally high, the controller will continue operation at 100% voltage.
Problem on Machine	The fuel control knob cannot control the engine speed.
Relevant Information	The signal voltage of the fuel control knob can be checked using the monitoring function (Code: 03000 Fuel Control Knob Voltage). Method of reproducing the fault code: Turn the starting switch to the ON position.

2. Troubleshooting

The following are possible causes and detection methods:

Issues with The Throttle Sensor Power Supply System

Diagnosis method: If fault code [CA2186] is also indicated, perform fault diagnosis for [CA2186] first.

Issues with the Fuel Control Knob

Diagnosis method: Turn the start switch to the OFF position, be prepared, and then turn the start switch to the ON position.
Standard values:

P20		Voltage
Between（1）-（3）	Power Supply	4.75-5.25V

Note: If the voltage is abnormal, check the wire harness and controller as potential causes before making a judgment.

Wire Harness Around Fault (Short Circuit to Ground Circuit)

Diagnosis method: Turn the start switch to the OFF position, be prepared, and then perform diagnosis without turning the start switch ON.
Standard values:

Wiring harness

Resistance value

Between CE02(female)(9) - P20(female)(2)

Min.100Ω

Short Circuit in Wire Harness (with Another Wire Harness)

Diagnosis method: Turn the start switch to the OFF position, be prepared, and then perform diagnosis without turning the start switch to the ON position.
Standard values:

Wiring harness	Resistance value
Between CE02(female)(9) - P20(female)(2) and between CE02(female)(23) - P20(female)(3)	Min.100Ω

Issues with Wire Harness Connectors

The connecting components between the fuel control knob, machine wire harness, and engine controller may be faulty. Check these connecting components directly:

Loose connectors, broken locks, or damaged seals.
Corroded, bent, damaged, pushed-in, or swollen pins.
Moisture or dirt in the connectors, or poor insulation in the connectors.

Faulty Engine Controller

Diagnosis method: Turn the start switch to the OFF position, be prepared, then turn the start switch to the ON position to perform fault diagnosis.
Standard values:

CE02		Voltage
Between（22）-（23）	Power Supply	4.75-5.25V

3. More Technical Support

If you need more information or further assistance, please feel free to let us know via live chat or email: service@sinocmp.com. We will reach out to you ASAP.

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