INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (SIGNAL READING CHECK)
Note
Both present and history signal readings will be cleared if the engine room junction block assembly is removed. Make sure not to remove it before inspection.
Tech Tips
The signal readings of the engine room junction block assembly can be checked by inspecting the voltage at the diagnosis terminal.
Signal reading check
Turn the engine switch on (IG).
*a | Component with harness connected (Engine Room Junction Block Assembly) |
*b | Diagnosis Terminal |
Connect the positive (+) terminal of a voltmeter to the engine room junction block assembly and the negative (-) terminal to the body ground.
Using the illustration below as a reference, determine whether any channels are malfunctioning based on the observed signal reading.
Tech Tips
Present signal reading and history signal reading will be displayed alternately after the engine switch is turned to on (IG). By measuring the duration of each header, the present signal reading and history signal reading can be recognized.
A unit malfunction indicates an internal malfunction of the engine room junction block assembly. If a malfunction is detected for any channel from channel 0 to 9, an electrical load connected to the engine room junction block assembly may be malfunctioning or there may be a short in the engine room junction block assembly circuit or in the wire harness.
The present signal reading will be stored as a history signal reading when electrical loads are operated after a malfunctioning part returns to normal.
Both present and history signal readings can be cleared by disconnecting the cable from the negative (-) battery terminal.
Regarding electrical loads connected to channels 0 to 9, refer to the table below:
Channel | Connected Electrical Load | ||
---|---|---|---|
for 2GR-FE | for 2AR-FE | ||
w/ Rear Fog Light or w/ Mirror Heater | w/o Rear Fog Light and w/o Mirror Heater | ||
ch0 | Magnetic clutch | Radiator fan motor | Radiator fan motor |
ch1 | - | Condenser fan motor | Condenser fan motor |
ch2 | Stop lights | ||
ch3 | Rear fog lights | Rear fog lights | - |
ch4 | Daytime running lights | ||
ch5 | Front fog lights | ||
ch6 | Rear window defogger wire | ||
ch7 | - | Mirror heater | - |
ch8 | High beam headlight LH | ||
ch9 | High beam headlight RH |
INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK)
Results of signal reading check
Depending on the signal reading, perform troubleshooting according the table below.
Output Signal Reading | Repair Method |
---|---|
Normal | Continue troubleshooting for each system. |
The unit is malfunctioning. | Replace the engine room junction block. |
A malfunction in a channel (ch0 to ch9) |
|
Tech Tips
Make sure to clear the signal readings by disconnecting the cable from the negative (-) battery terminal after replacement or repair of the malfunctioning part.
*a | Component without engine room junction block assembly (Engine Room Relay Block and Junction Block Assembly) |
If no signal readings are output, perform troubleshooting according to the following troubleshooting procedure.
Remove the engine room junction block assembly Click here.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
If the result is not as specified, repair or replace the wire harness or connector.