Error Messages / Malfunctions; Error Messages In The Co Display Field - Bosch ETT 008.31 Repair Instructions

7

Error messages / malfunctions

The exhaust-gas analyzer is equipped with extensive self-test functions. Malfunctions which can be detected automatically are indicated
by means of the error messages described below (Sections 7.1 to 7.3).
Error messages are displayed in two forms:
a) One group (Sections 7.1 and 7.2) takes the form of binary numbers (1, 2, 4, 8, etc.). In this way, several errors may be displayed
at the same time. For example: Err 7 = Err 1 and Err 2 and Err 4.
b) In the other group (Section 7.3), the error is indicated directly by means of symbolic error text. These messages appear in the
measured-value window in question.
A few other possible malfunctions are described, together with instructions for dealing with them, in Section 7.4.
7.1

Error messages in the CO display field

Error messages
Err 1
Err 2
Err 4
Err 16
Err 32
Err 64
Err 128
Possible cause
Amplifier output signal of HC measuring
outside tolerance
Amplifier output signal of CO measuring
channel outside tolerance
Amplifier output signal of CO
channel outside tolerance
Overflow in O measuring channel.
2
Measured value at O amplifier output > 5 V.
2
O measuring sensor not connected or
2
faulty or incorrect processing of measured
values.
Temperature signal of tmeperature
compensation outside tolerance
Supply voltage outside tolerance
CMOS-RAM check failed
Trouble-shooting
See Section 8.7 "Faulty channel amplifier"
See Section 8.7 "Faulty channel amplifier"
measuring See Section 8.7 "Faulty channel amplifier"
2
See Section 8.12 "Faulty O2 measuring
channel
See Section 8.6 "Faulty temperature
compensation"
See Section 8.13
"Supply-voltage alarm"
See Section 8.4 "RAM check error"
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