water separator warning light does not light even when water exceeds water separator drain line

1. Water separator warning light does not light even when water exceeds water separator drain line diagnostics

1. Pre-check and visual inspection

1) Check that the sedimenter warning light in the instrument panel cluster illuminates for 3 seconds when the ignition switch is turned ON.

If it does not illuminate, replace the instrument panel cluster.

2) Check for any interference from aftermarket electronic components such as two-way radios or lights.

Turn OFF or remove any aftermarket electronic components to ensure that there is no influence on inspections or operations.

2. Components inspection

1) Inspect the water sedimenter switch.

Refer to "1.Engine 1C.Fuel System(4JJ3 with DPD) water sedimenter switch inspection".

Refer to "1.Engine 1C.Fuel System(4JJ3 without DPD) water sedimenter switch inspection".

Refer to "1.Engine 1C.Fuel System(RZ4E-TC) water sedimenter switch inspection".

Replace if there are water sedimenter switch malfunctions.

Refer to "1.Engine 1C.Fuel System(4JJ3 with DPD) water sedimenter switch removal".

Refer to "1.Engine 1C.Fuel System(4JJ3 with DPD) water sedimenter switch installation".

Refer to "1.Engine 1C.Fuel System(4JJ3 without DPD) water sedimenter switch removal".

Refer to "1.Engine 1C.Fuel System(4JJ3 without DPD) water sedimenter switch installation".

Refer to "1.Engine 1C.Fuel System(RZ4E-TC) water sedimenter switch removal".

Refer to "1.Engine 1C.Fuel System(RZ4E-TC) water sedimenter switch installation".

2) Inspect the instrument panel cluster.

Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster diagnostics".

If a malfunction is found in the instrument panel cluster, replace it.

Caution

If the instrument panel cluster is replaced with a new one, write the vehicle information to the instrument panel cluster.

Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster removal".

Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster installation".

Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. instrument panel cluster setting".

3. Circuit inspection

1) Check that the ground point is normal.

Repair or clean any ground points that are improperly installed or significantly dirty.

2) Check that the harnesses and connectors are normal.

Inspect for the following circuits for an open circuit, short, poor connections at the connectors, and abnormal conditions such as worn or bent harnesses.

Between the instrument panel cluster and the water sedimenter switch

Caution

When checking the continuity between the harnesses, disconnect the battery negative terminal.

Refer to "201.General Information 14A.Service Information Guide Preliminary and post procedures".