Toyota RAV4 Service Manual: On-vehicle inspection
Notice:
- Perform the maf meter inspection according to the
procedures below.
- Only replace the maf meter when both the long
ft#1 value and maf value in the data list (with the
engine stopped) are not within the normal operating
range.
- Inspect mass air flow meter

- Perform confirmation driving pattern.
- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on.
- Turn the tester on.
- Clear the dtcs (see page es-35).
- Start the engine and warm it up with all
accessory switches off until the engine
coolant temperature is 75°c (167°f) or more.
- Drive the vehicle at 50 km/h (31 mph) or more
for 3 to 5 minutes*1.
- Allow the engine to idle for 2 minutes*2.
- Perform steps *1 and *2 at least 3 times.

- Read the value using the intelligent tester (long
ft#1).
- Select the following menu items: diagnosis /
enhanced obd ii / data list / primary /
long ft#1.
- Read the values displayed on the tester.
Standard value:
within -15 to +15%
If the result is not within the specified range,
perform the inspection below.
- Read the value using the intelligent tester (maf).
Notice:
- Turn off the engine.
- Perform the inspection with the vehicle
indoors and on a level surface.
- Perform the inspection of the maf meter
while it is installed to the air cleaner case
(installed to the vehicle).
- During the test, do not use the exhaust air
duct to perform suction on the exhaust pipe.
- Turn the ignition switch to acc.
- Turn the ignition switch on (do not run the
engine).
- Turn the tester on.
- Select the following menu items: diagnosis /
enhanced obd ii / data list / primary /
maf.
- Wait 30 seconds, and read the values on the
intelligent tester.
Standard condition:
less than 0.45 G/sec.
- If the result is not as specified, replace the
maf meter.
- If the result is within the specified range,
inspect the cause of the extremely rich or
lean air-fuel ratio (see page es-147).
Disconnect cable from negative battery terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensi ...
Other materials:
How to proceed with troubleshooting
Hint:
Use these procedures to troubleshoot the supplemental
restraint system.
*: Use the intelligent tester.
Vehicle brought to workshop
Inspect battery voltage*
Standard voltage:
11 to 14 v
If the voltage is below 11 v, recharge or replace the battery
before proceeding.
...
How to proceed with troubleshooting
Hint:
*: Use the intelligent tester.
Hint:
If the display indicates a communication fault in the tester,
inspect the dlc3.
Hint:
Record or print dtcs and freeze frame data, if necessary.
Hint:
If the engine does not start, first perform the "check dtc"
procedures a ...
Center airbag sensor assembly communication circuit malfunction
Description
The center airbag sensor communication circuit consists of the occupant
classification ecu and the
center airbag sensor.
Dtc b1790 is recorded when a malfunction is detected in the center airbag sensor
communication circuit.
Wiring diagram
Inspection procedure
Hin ...