B1503

METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: B1503: Exhaust Heat Management Warning Detected
B1503 - Exhaust Heat Management Warning Detected

DESCRIPTION

This DTC is stored when the combination meter assembly (No. 3 meter circuit plate) detects a malfunction in the water temperature sensor that is connected to the combination meter assembly (No. 3 meter circuit plate) via a direct line.





HINT
This DTC is for the water temperature sensor which is used to detect the engine water temperature sensor for the exhaust heat recirculation system, not for the engine coolant temperature sensor which is used for the EFI system.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Set the vehicle in the maintenance mode using the Techstream Component Tests and General Diagnostics.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Combination Meter / Data List.

(f) Check the values by referring to the table below.

Combination Meter





HINT
* The coolant temperature value in this inspection is the data sent from the engine coolant temperature sensor for the SFI system.
* When the Data List values do not match, a signal output error of the ECM is suspected.

OK:

Engine coolant temperature displayed on the Techstream is 80 to 100°C (176 to 212°F) after warming up.

NG -- GO TO EXHAUST HEAT RECIRCULATION SYSTEM Symptom Related Diagnostic Procedures
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (NO. 3 METER CIRCUIT PLATE - WATER TEMPERATURE SENSOR)

(a) Disconnect the G2 connector.

(b) Disconnect the L27 connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. WATER TEMPERATURE SENSOR

(a) Remove the water temperature sensor Removal.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPLACE WATER TEMPERATURE SENSOR Removal

OK -- REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) Disassembly