3.1.13-148
CS35 2013.04
3.1.13-148Electronic Control System - ME7
3. Inspect the pre - catalytic oxygen sensor condition (carry out oxygen sensor signal test)
A. If the data stream shows voltage is consistently
below 0.45 V (mixture too thin), inspect the following
steps:
• Jet proper amount of propane into the inlet port.
• Observe if the pre - catalytic oxygen sensor data
stream voltage changes obviously, the signal voltage
will rise quickly.
B. If the data stream shows voltage is consistently
above 0.45 V (mixture too dense), inspect the
following steps:
• Position the transmission at neutral gear.
• Pull the hand brake.
• Press the accelerator pedal till the engine speed sud-
denly increased to 4,000 rpm and then quickly
release the accelerator pedal.
• Repeat the previous step more than 3 times.
• Observe if the pre - catalytic oxygen sensor data
stream voltage changes obviously, the signal voltage
will drop quickly.
• In the implementation of the above test, the oxygen
sensor signal voltage should change significant as
the test continues.
Does the oxygen sensor signal voltage change sig-
nificantly?
Y
Inspect the reason that caused the engine air - fuel
ratio is too thin / too dense.
N
Go to step 4.
4. Inspect the pre - catalytic oxygen sensor signal circuit
Test Conditions Details/Results/Actions
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