Status code -07 Accelerator voltage too high on power
up after initial key switch closure.

Possible causes:
Accelerator input mis-adjusted or defective.

=
Input voltage at P7 should be less than 3.7
volts. Adjust or replace accelerator unit to
insure that the voltage at P7 will vary from 3.5
volts to less than.5 volts when the pedal is
depressed.
Open circuit between battery negative and P7 in
accelerator input circuit.

=
Check for broken wires or loose connections
or open potentiometer / voltage supply.
Short circuit from battery positive to wiring in
accelerator input circuit.

=
Disconnect wire from P7 and measure
voltage at wire to negative. Should be zero
volts for potentiometer type and less than 3.7
volts for solid state type accelerator input.

The reference to 'P7' is for the wiper circuit wire in the accelerator potentiometer, so what it is saying is to check the potentiometer for shorts to negative.

Sounds to me like a defective accelerator pot