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When the CA1091 truck is released, the oil pressure warning lamp on the dashboard is not lighted when the ignition switch is turned on. Troubleshooting: (1) cause analysis of the cause of failure. The possible reasons for the failure of the oil pressure warning lamp are: 1) the contact of the oil pressure switch contacts is not good. 2) the oil pressure warning lamp is burnt out. 3) the circuit of the oil pressure warning lamp has a circuit breaker. (2) troubleshooting method will pull the connection on the oil pressure switch and then connect it directly, then switch on the ignition switch to see if the oil pressure warning light is on. The result of the test is that the oil pressure warning light can be lighted, indicating that the internal contact of the oil pressure switch is not good. (3) troubleshooting measures to replace the oil pressure switch, the oil pressure warning light is working properly, troubleshooting. Fault analysis: when connecting the connection sensor directly to the iron, if the oil pressure warning lamp is not bright, the connection line between the oil pressure switch and the combination instrument should be checked. If the line is normal, the combined dashboard should be removed for inspection.